A car traveling in a straight line at 14 m/s when the driver puts on the brakes and comes to a stop in 35 m. How much time did it take for the car to come to a stop?

Answers

Answer 1

To calculate the time it took for the car to come to a stop, we can use the formula:

distance = (initial velocity x time) + (0.5 x acceleration x time^2)

In this case, the initial velocity (v) is 14 m/s, the distance (d) is 35 m, and the acceleration (a) is the deceleration due to braking, which is typically around -9.8 m/s^2.

We can rearrange the formula to solve for time:

time = (sqrt(2ad + v^2) - v) / a

Plugging in the values, we get:

time = (sqrt(2(-9.8)(35) + 14^2) - 14) / -9.8
time = (sqrt(-686 + 196) - 14) / -9.8
time = (sqrt(490) - 14) / -9.8
time = (22.14 - 14) / -9.8
time = 0.84 seconds

Therefore, it took the car 0.84 seconds to come to a stop.

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Related Questions

A boat is moored in a fixed location, and waves make it moveup and down. If the spacing between wave crests is 20 m and thespeed of the waves is 5 m/s, how long does it take the boat to gofrom the top of a crest to the bottom of a trough ?a. 1 sb. 2 sc. 3 sd. 4se. 5 s

Answers

Since the speed of the wave is 5 m/s, the time it takes for the wave to travel 20m is 2 s.

What is speed ?

Speed is a measure of how quickly an object or person moves from one point to another. It is typically measured in units of distance per unit of time, such as miles per hour or meters per second. Speed is a combination of two components: the magnitude (or amount) of the motion, and the direction in which the motion is taking place. Speed can be thought of as a scalar quantity, since it only has magnitude and does not take direction into account.

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Perhaps surprisingly, a pattern of fringes can also be produced if the double slit screen is replaced with a screen having only one slit. Provide possible explanations for this observation.

Answers

The resulting pattern is known as the single-slit interference pattern, and the spacing between the fringes is dependent on the width of the slit.

When light passes through a single slit, it diffracts and spreads out, creating a diffraction pattern. This pattern is due to the interference of the diffracted waves, which can be constructive or destructive depending on the angle at which they interfere. The pattern of bright and dark fringes that results from this interference is known as a single-slit diffraction pattern.

When a screen with a single slit is placed in front of a screen or detector, the light passing through the slit will form a diffraction pattern on the screen. However, if there is another screen behind the single-slit screen, the diffracted waves can interfere with each other and form a pattern of fringes. This pattern is due to the interference of the waves passing through the slit with waves that have been diffracted by the edges of the slit itself. This phenomenon is known as the single-slit interference pattern.

The spacing between the fringes in the single-slit interference pattern is dependent on the width of the slit. A wider slit will produce a pattern with wider-spaced fringes, while a narrower slit will produce a pattern with closer-spaced fringes.

In summary, the pattern of fringes produced by a single slit is due to the interference of waves passing through the slit and waves diffracted by the edges of the slit itself. The resulting pattern is known as the single-slit interference pattern, and the spacing between the fringes is dependent on the width of the slit.

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During the full moon phase, how much of the Moon's surface is being illuminated by sunlight?

Answers

The full moon phase is when the Moon is completely illuminated by sunlight, meaning 100% of its surface is lit up.

What is sunlight?

Sunlight is the direct light from the sun that is visible to the human eye. It is made up of ultraviolet, visible, and infrared light and is essential for the survival of living things. Sunlight helps organisms to produce food through photosynthesis and also helps to regulate the sleep/wake cycle in humans. Sunlight is an important source of vitamin D, which is essential for healthy bones and tissues. Sunlight also helps to regulate the Earth's temperature and weather patterns. Sunlight is an important part of the Earth's energy balance and is necessary for the health of all living things. Without sunlight, life on Earth would not be possible. Sunlight has been used by humans for centuries for warmth and to help with the growth of crops. Sunlight is a renewable energy source that can be used to generate electricity through solar panels and can also be used to heat water.

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What is the temperature increase of 4.0 kg of water when heated by an 800-W immersion heater for 10 min? (cw = 4 186 J/kg⋅°C)
a. 56°C
b. 51°C
c. 29°C
d. 14°C

Answers

Option (b.) 51°C

Explanation:
First, we need to calculate the amount of heat energy supplied to the water by the immersion heater using the formula:

Q = Pt

where Q is the heat energy (in joules), P is the power of the immersion heater (in watts), and t is the time (in seconds).

We need to convert 10 minutes to seconds:

t = 10 min x 60 s/min = 600 s

Now we can calculate Q:

Q = 800 W x 600 s = 480,000 J

Next, we can use the formula for specific heat capacity:

Q = mcΔT

where m is the mass of the water (in kilograms), c is the specific heat capacity of water (4,186 J/kg°C), and ΔT is the temperature increase (in °C).

We can rearrange this formula to solve for ΔT:

ΔT = Q / (mc)

Substituting the values we have:

ΔT = 480,000 J / (4.0 kg x 4,186 J/kg°C)

ΔT = 28.8°C

Therefore, the temperature increase of the water is 28.8°C.

But remember, the question asks for the temperature increase of the water, not the final temperature. So we need to add the initial temperature of the water to ΔT:

Initial temperature of the water is not given, but assuming it is 20°C (room temperature),

Temperature increase = 28.8°C + 20°C = 48.8°C ≈ 51°C

Therefore, the answer is b. 51°C.

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how long must a 100 N net force act to produce a change in momentum of 200 kg m/s?

Answers

Here is your Answer:

0.25 s

Originally Newton did not use the concept of acceleration or velocity in his laws. Instead he used the term

Answers

Yes. originally Newton did not use the concept of acceleration or velocity in his laws, he used the terms instead cause it was already known.

Force(F) applied on the body is mass(m) times its acceleration(a). i.e. F=ma according to this equation we get acceleration as a = F/m this equation says that when we apply more force to the body, more acceleration it gets. When more is the mass of the body, greater force is needed to accelerate with same amount to that less mass.

when newton was sitting under the apple tree, an apple felled on his head where he got idea about law of gravitation.

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what would happen if a collapsing interstellar cloud formed only a protostar without an accretion disk around it

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If a collapsing interstellar cloud formed only a protostar without an accretion disk around it.

When an interstellar cloud collapses under its own gravity, it can form a protostar. However, the protostar is often surrounded by a rotating disk of gas and dust called an accretion disk. This disk is important because it allows material to fall onto the protostar, increasing its mass and causing it to grow in size.

If a collapsing interstellar cloud formed only a protostar without an accretion disk around it, the protostar would not be able to accrete additional material as effectively. This would limit its growth and could result in a smaller final size than if it had an accretion disk.

Without an accretion disk, the protostar would also not be able to form planets or other objects in orbit around it. Planets form from the leftover material in the accretion disk that orbits the protostar. Without an accretion disk, there would be no material available to form planets.

Additionally, the lack of an accretion disk could affect the rotation of the protostar. The accretion disk is responsible for transferring angular momentum away from the protostar, allowing it to spin faster. Without an accretion disk, the protostar may not be able to shed its excess angular momentum, leading to slower rotation.

Hence, the formation of a protostar without an accretion disk would have a significant impact on the subsequent evolution of the system, limiting the growth of the protostar and preventing the formation of planets.

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If the distance between a point sound source and a dB detector is increased by a factor of 4, what will be the reduction in intensity level? a. 16 dB b. 12 dB c. 4 dEB d. 0.5 dB

Answers

The reduction in intensity level when the distance between a point sound source and a dB detector is increased by a factor of 4 is 12 dB. The correct option is b.

This is because the intensity of sound waves decreases with distance, following the inverse square law. This means that the intensity decreases by a factor of 4 for every doubling of distance.

Therefore, increasing the distance by a factor of 4 (which is equivalent to doubling the distance twice) results in a reduction in intensity of 16 times (4 times 4).

This corresponds to a decrease in intensity level of 12 dB, as each 10-fold reduction in intensity level corresponds to a decrease of 10 dB.

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Prediction 1-1: As you compress the air in a syringe by pushing the piston in slowly, what will happen to the pressure? What do you think will be the mathematical relationship between pressure P and volume V?

Answers

As you compress the air in a syringe by pushing the piston in slowly, the pressure will increase. The mathematical relationship between pressure (P) and volume (V) is given by Boyle's Law, which states that for a given amount of gas at a constant temperature, the product of pressure and volume remains constant.

Mathematically, this is represented as:

P1 * V1 = P2 * V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume. In this case, as the volume (V) decreases, the pressure (P) will increase proportionally, maintaining the constant product of pressure and volume.Therefore,As you compress the air in a syringe by pushing the piston in slowly, the pressure will increase.

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a 2.5 kg , 20-cm -diameter turntable rotates at 100 rpm on frictionless bearings. two 550 g blocks fall from above, hit the turntable simultaneously at opposite ends of a diameter, and stick. what is the turntable's angular velocity, in rpm , just after this event?

Answers

The turntable's angular velocity is 0 rpm.

How to find turntable's angular velocity?

Before the blocks are dropped, the turntable has a certain angular momentum, given by:

L = Iω

where L is the angular momentum, I is the moment of inertia, and ω is the angular velocity.

The moment of inertia of a disc rotating about its central axis is:

I = (1/2)MR²

where M is the mass of the disc and R is its radius.

Substituting the given values, we get:

I = (1/2)(2.5 kg)(0.1 m)² = 0.0125 kg⋅m²

The initial angular velocity of the turntable is:

ωi = 100 rpm

The two blocks fall simultaneously and stick to the turntable, causing it to experience an angular impulse. Since the blocks stick together and rotate with the turntable after the collision, we can assume that no energy is lost in the collision.

The angular impulse is given by:

ΔL = IΔω

where ΔL is the change in angular momentum and Δω is the change in angular velocity.

Since the blocks hit the turntable simultaneously at opposite ends of a diameter, their contributions to the change in angular momentum cancel out. Therefore:

ΔL = 0

After the collision, the turntable and the two blocks rotate as one object, with a new moment of inertia:

I' = I + 2MR²

where M is the mass of each block.

Substituting the given values, we get:

I' = 0.0125 kg⋅m² + 2(0.55 kg)(0.1 m)² = 0.0195 kg⋅m²

The final angular velocity of the turntable is:

ωf = ΔL/I' = 0/0.0195 = 0

This means that the turntable stops rotating after the blocks are dropped and stick to it. Therefore, the final angular velocity is 0 rpm.

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11. Would it be possible to place a non-reflective coating on an airplane to cancel radar waves of wavelength 3 cm?

Answers

Yes, it would be possible to place a non-reflective coating on an airplane to cancel radar waves of wavelength 3 cm.

The process of canceling radar waves is called stealth technology. In stealth technology, materials with a low radar cross-section are used to make an object less visible to radar. This means that the object will not reflect radar waves and will therefore be less visible on radar screens.

To achieve stealth technology, a non-reflective coating is applied to the surface of the airplane. This coating is made up of a combination of materials that have the ability to absorb radar waves of the 3 cm wavelength. When the radar waves hit the surface of the coating, they are absorbed instead of being reflected back to the radar station.

In conclusion, placing a non-reflective coating on an airplane to cancel radar waves of wavelength 3 cm is possible through the use of stealth technology. This involves using materials with a low radar cross-section, a non-reflective coating, and designing the shape of the airplane to deflect radar waves away from the radar station.

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(C) Inside the metal sphere E = 0. Once outside the sphere E decreases as you move away so the
strongest field will be the closest point to the outside of the sphere
A hollow metal sphere of radius R is positively charged. Of the following distances from the center of the sphere, which location will have the greatest electric field strength?

(A) 0 (center of the sphere)
(B) 3R/2
(C) 5R/4
(D) 2R
(E) None of the above because the field is of constant strength

Answers

At 3R/2 location will have the greatest electric field strength. The correct option is (B).

The electric field is a physical quantity used to describe the influence that an electric charge exerts on other charges in its vicinity. An electric charge creates an electric field in the space around it, which can be represented as a vector field. The electric field at a point in space is defined as the force per unit charge that would be experienced by a hypothetical small positive test charge placed at that point, assuming that the other charges in the system are held constant.

Inside the metal sphere, the electric field is zero because the charges in the metal sphere will distribute themselves evenly on its surface, canceling out any electric field inside the sphere. So, option (A) 0 is not correct.

Outside the metal sphere, the electric field decreases as the distance from the center of the sphere increases. According to Coulomb's law, the electric field at a distance r from a point charge Q is proportional to Q/r^2. The positively charged metal sphere can be modeled as a point charge at its center, with a total charge of Q. So, the electric field strength at a distance r from the center of the sphere is proportional to Q/r^2.

For any distance r greater than the radius R of the sphere, the electric field strength can be calculated using Coulomb's law. The electric field strength will be greatest at the point closest to the surface of the sphere, which corresponds to option (B) 3R/2. At this distance, the electric field strength will be proportional to Q/(3R/2)^2 = 4Q/9R^2.

Option (C) 5R/4 and option (D) 2R are both farther away from the surface of the sphere than option (B), so the electric field strength will be lower at those distances. Option (E) is not correct because the electric field strength decreases as the distance from the center of the sphere increases, and is not constant.

Therefore, The correct option is (B) 3R/2.

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A 5.0-kg object is suspended by a string from the ceiling of an elevator that is accelerating downward at a rate of 2.6 m/s2. What is the tension in the string?
1) 49 N
2) 36 N
3) 62 N
4) 13 N
5) 52 N

Answers

The tension in the string is 49 N, which is option 1.

When an object is suspended by a string, the tension in the string is equal to the weight of the object. The weight of the object can be calculated as follows:

Weight = mass x acceleration due to gravity

where mass is the mass of the object and acceleration due to gravity is the acceleration experienced by an object due to the Earth's gravitational force, which is approximately 9.8 m/s^2.

In this problem, the elevator is accelerating downwards at a rate of 2.6 m/s^2. Since the object is suspended by a string, its acceleration will also be 2.6 m/s^2 downwards, which means that the net acceleration of the object will be:

Net acceleration = acceleration due to gravity - acceleration of the elevator

Net acceleration = 9.8 m/s^2 - 2.6 m/s^2

Net acceleration = 7.2 m/s^2 downwards

Now we can calculate the weight of the object:

Weight = mass x acceleration due to gravity

Weight = 5.0 kg x 9.8 m/s^2

Weight = 49 N

Therefore, the tension in the string is 49 N, which is option 1.

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A car traveling down the road at 25.0 m/s has a wheel spinning at 45.0 rad/s. A deer jumps in front of the car causing the driver to slam on the brakes and slow to 10.0 rad/s in 1.75 s. How many revolutions does the wheel pass through as it slows down?

Answers

The wheel passes through approximately 6.28 revolutions as it slows down.

We can use the equation for angular acceleration to solve this problem:

α = (ωf - ωi) / t

where:

α = angular acceleration

ωi = initial angular velocity = 45.0 rad/s

ωf = final angular velocity = 10.0 rad/s

t = time interval = 1.75 s

Substituting the values given:

α = (10.0 rad/s - 45.0 rad/s) / 1.75 s = -20.0 rad/s^2 (negative sign indicates deceleration)

Now we can use the equation for angular displacement to find the number of revolutions:

θ = ωi t + (1/2) α t^2

where:

θ = angular displacement

ωi = initial angular velocity = 45.0 rad/s

t = time interval = 1.75 s

α = angular acceleration = -20.0 rad/s^2

Substituting the values given:

θ = (45.0 rad/s)(1.75 s) + (1/2)(-20.0 rad/s^2)(1.75 s)^2

θ = 39.53 rad

To find the number of revolutions, we need to convert radians to revolutions:

1 revolution = 2π radians

So, the number of revolutions is:

θ / (2π) = 39.53 rad / (2π) = 6.28 revolutions

Therefore, the wheel passes through approximately 6.28 revolutions as it slows down.

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assume that the hubble constant has been constant since the big bang. what is the possible range in the ages of the universe?

Answers

If the Hubble constant has been constant since the Big Bang, the age of the universe would be between 14 billion and 28 billion years.

If we assume that the Hubble constant has been constant since the Big Bang, then we can use the Hubble time, which is the reciprocal of the Hubble constant, to estimate the age of the universe.

The current best estimate of the Hubble constant is around 70 km/s/Mpc, which corresponds to a Hubble time of about 14 billion years. However, there is still some uncertainty in the value of the Hubble constant, and different measurements have given slightly different values, with some suggesting a value closer to 67 km/s/Mpc and others suggesting a value closer to 73 km/s/Mpc.Using the Hubble time of 14 billion years and assuming a constant Hubble constant, we can estimate the age of the universe to be between 14 billion and 28 billion years. However, if the true value of the Hubble constant is lower or higher than the current best estimate, then the age of the universe would be correspondingly higher or lower.

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the linear speed of the tip of the minute hand of a regular clock whose hand is 7.2 cm in length? group of answer choices 1.25 x 10-4 m/s 1.25 x 10-5 m/s 2 x 10-4 m/s 2.5 x 10-5 m/s 2.5 x 10-5 m/s 2 x 10-5 m/s

Answers

Linear speed of the tip of the minute hand of regular clock whose hand is 7.2 cm in length is : 1.25 x 10⁻⁴ m/s.

What is meant by minute hand of regular clock?

Minute hand of any regular clock completes one full revolution in 60 minutes ( 3600 seconds) and linear speed of the tip of minute hand can be calculated as follows:

Distance traveled by the tip of minute hand = Circumference of the circular path traced by tip of the minute hand

= 2πr, where r is length of the minute hand

Therefore, distance traveled by the tip of the minute hand = 2π(7.2 cm) = 45.12 cm

Time taken to travel this distance = Time taken for one revolution = 3600 seconds

Therefore, the linear speed of the tip of the minute hand = Distance traveled ÷ Time taken

= 45.12 cm ÷ 3600 seconds

= 0.01253333 cm/s

= 1.25 x 10⁻⁴ m/s.

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a man standing 1.50 m in front of a shaving mirror produces an inverted image 18.4 cm in front of it. how close to the mirror should he stand if he wants to form an upright image of his chin that is twice the chin's actual size?

Answers

The man should stand 0.465 m away from the mirror to form an upright image of his chin that is twice the chin's actual size.

To form an upright image that is twice the chin's actual size using a concave shaving mirror, the man should stand at the focal point of the mirror. The mirror equation can be used to find the required distance:
1/f = 1/u + 1/v
where f is the focal length, u is the object distance, and v is the image distance.

Given that, u = -1.50 m and v = -0.184 m (inverted image is formed on the same side as the object). We can find the focal length:

1/f = 1/(-1.50) + 1/(-0.184)
1/f = -0.667 - 5.435
f = -0.155 m

Since he wants an upright image that is twice the chin's actual size, the magnification should be -2. The magnification formula is:

M = -v/u

So, -2 = -v/(-0.155) => v = 0.31 m

Now we can use the mirror equation again to find the new object distance (u'):

1/(-0.155) = 1/u' + 1/0.31
u' = 0.465 m

The man should stand 0.465 m away from the mirror to form an upright image of his chin that is twice the chin's actual size.

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IS the mechanical energy constant during the time the mass falls toward the Earth?

Answers

No, the mechanical energy is not constant during the time the mass falls toward the Earth.

This is because as the mass falls, it loses potential energy due to the decrease in its height, and gains kinetic energy due to its increase in speed. This means that the total mechanical energy, which is the sum of the potential and kinetic energies, is conserved only if there is no external work done on the mass.

However, in reality, there are several factors that can cause the mechanical energy to change, such as air resistance, friction, and the deformation of the mass and the Earth's surface upon impact. Air resistance, for example, can cause the mechanical energy to decrease as some of the energy is dissipated as heat due to the resistance of the air. Friction and deformation can also cause the mechanical energy to decrease by converting some of the energy into other forms, such as heat or sound.

Therefore, the conservation of mechanical energy is an idealized concept that assumes an isolated system with no external work done on it. In reality, mechanical energy is often not conserved due to various factors that can cause energy to be converted into other forms.

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suppose that, for some unknown reason, the core of the sun suddenly became hotter and the rate of nuclear fusion thereby increased. what would happen next?

Answers

If the sun's core temperature suddenly increased, leading to an increase in nuclear fusion, the sun would expand, become more luminous, and potentially cause various effects on Earth due to the increased energy output.

If the core of the sun suddenly became hotter and the rate of nuclear fusion increased, the following would happen:

1. Increased nuclear fusion: As the core temperature rises, the rate of nuclear fusion reactions would increase, causing hydrogen atoms to combine into helium at a faster pace. This would release more energy in the form of light and heat.

2. Expansion of the sun: The increased energy output would cause the sun to expand as the additional pressure from the fusion reactions pushes against the sun's gravitational pull.

3. Increased luminosity: With more nuclear fusion occurring, the sun would become more luminous, emitting more light and heat into space.

4. Effects on Earth: The increase in solar energy output could lead to various effects on Earth, such as warmer temperatures, climate changes, and potential harm to ecosystems.

In summary, if the sun's core temperature suddenly increased, leading to an increase in nuclear fusion, the sun would expand, become more luminous, and potentially cause various effects on Earth due to the increased energy output.

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what would be the magnitude of the momentum (in terms of p ) of a dog having two times the mass of the cat if it had the same kinetic energy as the cat?

Answers

The magnitude of the momentum of the dog in terms of the momentum of the cat is given by [tex]\sqrt(2)p_c.[/tex]

If two objects have the same kinetic energy, their momenta will be different if their masses are different. The momentum p of an object is given by:

p = mv

where m is the mass of the object and v is its velocity.

If the kinetic energy of the dog is the same as the kinetic energy of the cat, we can write:

[tex](1/2)mv_d^2 = (1/2)mv_c^2[/tex]

where m is the mass of the object (either the dog or the cat), and v_d and v_c are their respective velocities.

We are given that the mass of the dog is twice the mass of the cat:

[tex]m_d = 2m_c[/tex]

Substituting this into the equation for the kinetic energy and solving for the velocity of the dog in terms of the velocity of the cat, we get:

[tex](1/2)(2m_c)v_d^2 = (1/2)m_cv_c^2[/tex]

[tex]v_d^2 = v_c^2/2[/tex]

[tex]v_d = \sqrt(v_c^2/2) = v_c/\sqrt(2[/tex])

Now we can calculate the momentum of the dog in terms of the momentum of the cat:

[tex]p_d = m_dv_d = 2m_cv_c/\sqrt(2) = \sqrt(2)pm_c[/tex]

Therefore, the magnitude of the momentum of the dog in terms of the momentum of the cat is given by[tex]\sqrt(2)p_c.[/tex]

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Sitting in front of a fan on a hot summer day, you can see that the fan blade is moving clockwise. What is the direction of the fans angular displacement vector?

Answers

The direction of the fan's angular displacement vector depends on the coordinate system being used.

If we assume a standard right-handed coordinate system, with the positive x-axis pointing to the right, the positive y-axis pointing up, and the positive z-axis pointing out of the page (towards the viewer), then the fan's angular displacement vector would point in the negative z-axis direction.

This is because a clockwise rotation about the positive z-axis corresponds to a negative angular displacement. Alternatively, we could define a different coordinate system, in which case the direction of the fan's angular displacement vector would be relative to that system.

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Radioactive tritium (3H) labeled guanine has been used to measure the rate of biochemical processes that involve its binding or incorporation.
Given that water is the solvent for this type of experiment, what is the best site for tritium labeling?

Answers

Radioactive tritium (3H) labeled guanine is indeed used to measure the rate of biochemical processes that involve its binding or incorporation.

In this context, the best site for tritium labeling would be at the C8 position of the guanine molecule. This is because the C8 position is less likely to undergo exchange with the solvent (water) and maintains the integrity of the labeled guanine throughout the experiment. The best site for tritium labeling in this type of experiment would be the 8th position of the guanine molecule. This is because the 8th position is involved in biochemical processes such as base-pairing and is also solvent-accessible, allowing for efficient incorporation of the radioactive tritium.

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a playground merry-go-round has a mass of 120 kg and a radius of 1.80 m and it is rotating with a frequency of 0.500 rev/s. what is its angular velocity after a 22.0-kg child gets onto it by grabbing its outer edge? the child is initially at rest

Answers

The angular velocity of the merry-go-round after the child gets onto it is 2.34 rad/s.

Before the child gets onto the merry-go-round, its angular momentum is given by:

L = Iω

where I is the moment of inertia and ω is the angular velocity. The moment of inertia of a solid disk is I = (1/2)M[tex]R^2[/tex], where M is the mass of the merry-go-round and R is the radius. Substituting the given values, we have:

I = (1/2)(120 kg)(1.80 m[tex])^2[/tex] = 194.4 kg·[tex]m^2[/tex]

The initial angular velocity is given as ω = 2πf = 2π(0.500 rev/s) = 3.14 rad/s.

When the child gets onto the merry-go-round, the system becomes a combination of the child and the merry-go-round, and the moment of inertia of the system changes. The new moment of inertia is:

I' = I + M[tex]R^2[/tex]

where M is the mass of the child. Substituting the given values, we have:

I' = (1/2)(120 kg)(1.80 m[tex])^2[/tex] + (22.0 kg)(1.80 m[tex])^2[/tex] = 259.2 kg·[tex]m^2[/tex]

The angular momentum of the system is conserved, so we have:

L = I'ω'

where ω' is the new angular velocity. Solving for ω', we get:

ω' = L/I' = (Iω)/I' = (I/I')ω

Substituting the given values, we have:

ω' = (194.4 kg·[tex]m^2[/tex]/259.2 kg·[tex]m^2[/tex])(3.14 rad/s) = 2.34 rad/s

Therefore, the angular velocity of the merry-go-round after the child gets onto it is 2.34 rad/s.

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A 0.010 m radius drill bit rotates with a constant angular velocity of 5.0 rev/s. What is the linear acceleration of a point on the edge of the drill bit?

Answers

To find the linear acceleration of a point on the edge of a 0.010 m radius drill bit rotating with a constant angular velocity of 5.0 rev/s, we will follow these steps:

1. Convert the angular velocity from rev/s to rad/s.
2. Use the centripetal acceleration formula: a = rω².

Step 1: Convert the angular velocity from rev/s to rad/s.
Angular velocity (ω) = 5.0 rev/s
1 revolution = 2π radians
ω = 5.0 × 2π rad/s ≈ 31.42 rad/s

Step 2: Use the centripetal acceleration formula.
a = rω²
a = (0.010 m) × (31.42 rad/s)²
a ≈ 9.82 m/s²

The linear acceleration of a point on the edge of the 0.010 m radius drill bit rotating with a constant angular velocity of 5.0 rev/s is approximately 9.82 m/s².

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a stationary coil experiences a doubling of its magnetic field (no change in direction of the field) in a time t and has a given induced emf. if the same change were to have happened in half the time (t/2), the induced emf would have been:

Answers

The induced emf in the coil would be twice as much if the change in magnetic field were to happen in half the time.

How time change effect on induced emf?

According to Faraday's law of electromagnetic induction, the magnitude of the induced electromotive force (emf) in a coil is directly proportional to the rate of change of magnetic flux through the coil. Mathematically, this can be expressed as:

emf = -N dΦ/dt

where emf is the induced electromotive force, N is the number of turns in the coil, and dΦ/dt is the rate of change of magnetic flux through the coil.

Assuming that the coil is stationary, the change in magnetic field would induce an emf in the coil according to the above equation. If the magnetic field doubles in a time t, then the rate of change of magnetic flux would be:

dΦ/dt = Bf - Bi / t

where Bf is the final magnetic field, Bi is the initial magnetic field, and t is the time taken for the magnetic field to double.

If the same change in magnetic field were to happen in half the time (t/2), then the rate of change of magnetic flux would be:

dΦ/dt = Bf - Bi / (t/2)

= 2(Bf - Bi) / t

= 2dΦ/dt

Therefore, the induced emf in the coil would be twice as much if the change in magnetic field were to happen in half the time.

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Is conductance high or low during an action potential?

Answers

High. Conductance increases with depolarization

a thief is noticed by a policeman from a distance of 100 m. the thief starts running and the policeman chases him. the thief and the policeman run at the rate of 6km/hr and 8km/hr respectively. what is the distance covered by the thief before being caught

Answers

Before being caught by the policeman, the thief covers a distance of approximately 302.2 meters.

To solve this problem, we need to use the formula:

distance = speed x time

Let's first convert the speeds from km/hr to m/s:

Thief's speed = 6 km/hr = 6 x 1000 / 3600 m/s = 1.67 m/s
Policeman's speed = 8 km/hr = 8 x 1000 / 3600 m/s = 2.22 m/s

Now, let's assume that the thief is caught after time t seconds. During this time, the policeman runs a distance of 100 m + d, where d is the distance covered by the thief.

We can set up two equations using the formula above:

distance covered by thief = 1.67t
distance covered by policeman = 2.22t + 100

We want to find d, which is the distance covered by the thief before being caught. This means that the time it takes for the thief to be caught is the same as the time it takes for the policeman to catch him. Therefore, we can set the two equations equal to each other and solve for t:

1.67t = 2.22t + 100
0.55t = 100
t = 181.8 seconds

Now that we know the time it takes for the thief to be caught, we can plug it back into either equation to find d:

distance covered by thief = 1.67t
distance covered by thief = 1.67 x 181.8
distance covered by thief = 302.2 meters

Therefore, the thief covers a distance of 302.2 meters before being caught.

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A 15 g bullet is fired from a rifle. It takes 2.50x10³ s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.

Answers

The gun applies 100 N of force to the bullet. Force = mass x acceleration, where F = 0.01 x 10000 and N = 100. The gun applies 100 N of force to the bullet.

Which definition of acceleration is the best?

The pace at which a person's velocity changes is known as acceleration. acceleration (a) is the change in velocity over time. As a result, every change in velocity will result in acceleration whenever the speed or direction changes.

Does accelerating mean to go faster?

Most likely, you picture something racing up when you think about acceleration. But a moving thing accelerates as it slows down. A change in speed is what acceleration is, so keep that in mind. The speed of a car that would be slowing down decreases.

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Dose a rolling object travel faster or slower the further away it gets from the base of the ramp? Why?

Answers

The rolling object and the surface it's rolling on also contribute to the decrease in velocity.

A rolling object travels slower the further away it gets from the base of the ramp. This is due to the conservation of energy, where the initial potential energy of the object at the top of the ramp is converted to both kinetic energy and potential energy as the object rolls down the ramp. As the object moves away from the base of the ramp, it gains height and therefore potential energy, causing a reduction in kinetic energy and thus a decrease in velocity. Additionally, frictional forces between the rolling object and the surface it's rolling on also contribute to the decrease in velocity.

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Tripling the weight suspended vertically from a coil spring will result in a change in the displacement of the spring's lower end by what factor? A mass of 0.40 kg, attached to a spring with a spring constant of 80 N/m, is set into simple harmonic motion. What is the magnitude of the acceleration of mass when at its maximum displacement of 0.10 m from the equilibrium position?
(a) 5 m/s^2
(b) 20 m/s^2
(c) Zero
(d) 10 m/s^2

Answers

We can see that the angular acceleration of the object is given as 20 m/s^2. Option B

What is the angular velocity?

We have to know that the formula that we can use to obtain the angular acceleration in the case of the problem that we have here is;

a = -ω^2x

where a is the acceleration, ω is the angular frequency, and x is the displacement from the equilibrium position.

But we have to recall that we have;

ω= √(k/m)

We can now obtain the angular velocity as;

ω= √80/0.4

= 14.14 rad/s

Thus we have the angular acceleration as;

a = - (14.14)^2 * 0.1

a = - 20 m/s^2

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