The force of the string at the bottom is greater than the weight of the ball. The correct option is B.
What is Net force?When two or more forces are acting on the system of objects, then the to attain equilibrium, net force must be zero.
A girl at a state fair swings a ball in a vertical circle at the end of a string.
When the ball is at the bottom, the force acting will be
The tension in the string , T = mass x centripetal acceleration + Force of gravity
So, T = m x ac + mg
The tension in the cable at the bottom will have centripetal force and weight forces acting on it.
Thus, the force of the string at the bottom is greater than the weight of the ball.
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The diagram shows changes of state between solid, liquid, and gas. The atoms of a substance lose energy during a change of state. Before the change, the atoms are close together but are able to slide past one another.
A diagram has a triangle at center with gas on top, liquid on bottom right, solid on bottom left. An arrow from gas to liquid is labeled O, and an arrow from liquid to gas is labeled N. An arrow from solid to liquid is labeled P, and an arrow from liquid to solid is labeled Q. An arrow from solid to gas is labeled L, and an arrow from gas to solid is labeled M.
Which arrow represents the change of state described above?
M N P Q
Answer:
its Q
Explanation:
If a volume of air is warmed, it expands and tends to
if a volume of air is warmed it expands due to increased translational kinetic energy as it expands it will start to cool.
When does temperature increase volume?We can then conclude that at constant pressure, temperature and volume are directly proportional: temperature increases, volume increases; decrease temperature, decrease volume.
In this case, the higher the temperature, the greater the kinetic energy that acts on the molecules of this gas, so when the gas expands, these molecules find more space and collide less, which will cause the gas to cool.
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A boy throws a ball vertically up it returns the ground after 10 seconds find the maximum height reached by the ball
Answer:
Approximately [tex]122.625\; {\rm m}[/tex] (assuming that [tex]g = 9.81\; {\rm m\cdot s^{-2}}[/tex], the ball was launched from ground level, and that the drag on the ball is negligible.)
Explanation:
Let [tex]v_{0}[/tex] denote the velocity at which the ball was thrown upward.
If the drag (air friction) on the ball is negligible, the ball would land with a velocity of exactly [tex](-v_{0})[/tex]. The velocity of the ball would be changed from [tex]v[/tex] to [tex](-v_{0})\![/tex] (such that [tex]\Delta v = (-v_{0}) - v_{0} = (-2\, v_{0})[/tex]) within [tex]t = 10\; {\rm s}[/tex].
Also because the drag on the ball is negligible, the acceleration of the ball would be [tex]a = -g = -9.81\; {\rm m\cdot s^{-2}}[/tex]. Thus:
[tex]\Delta v = a\, t = 10\; {\rm s} \times (-9.81\; {\rm m\cdot s^{-2}}) = -98.1\; {\rm m\cdot s^{-1}}[/tex].
Since [tex]\Delta v = (-2\, v_{0})[/tex]:
[tex]-2\, v_{0} = \Delta v = -98.1\; {\rm m\cdot s^{-1}[/tex].
[tex]\begin{aligned}v_{0} &= \frac{-98.1\; {\rm m\cdot s^{-1}}}{-2}= 49.05\; {\rm m \cdot s^{-1}}\end{aligned}[/tex].
The ball reaches maximum height when its velocity is [tex]v_{1} = 0\; {\rm m\cdot s^{-1}}[/tex]. Apply the SUVAT equation [tex]x = ({v_{1}}^{2} - {v_{0}}^{2}) / (2\, a)[/tex] to find the displacement [tex]x[/tex] between the original position (ground level, where [tex]v_{0} = 49.05\; {\rm m\cdot s^{-1}}[/tex]) and the max-height position of the ball (where [tex]v_{1} = 0\; {\rm m\cdot s^{-1}}[/tex].)
[tex]\begin{aligned}x &= \frac{(0\; {\rm m\cdot s^{-1}})^{2} - (49.05\; {\rm m\cdot s^{-1}})^{2}}{2 \times (-9.81\; {\rm m\cdot s^{-2}})} \\ &\approx 122.625\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].
A coin is located 35.0 mm from the center of a turntable which accelerates from rest to a speed of 7.95 rad/s in 0.270 s. What is the minimum coefficient of friction to avoid slippage of the coin
The minimum coefficient of friction to avoid slippage of the coin is 0.23.
Minimum coefficient of friction
The minimum coefficient of friction can determined from the maximum speed of the coin.
ma = μmg
mv²/r = μmg
v²/r = μg
v² = μgr
μ = v²/(gr)
μ = (ωr)²/(gr)
μ = ω²r/g
μ = (7.95² x 0.035)/(9.8)
μ = 0.23
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When you see a quantity like 20 m/s N, how do you know that it's a vector quantity and not a scalar quantity?
We know that 20 m/s N is a vector quantity because N in the expression signifies the direction
What is a vector quantity?This is a which have both magnitude and direction. Example include:
VelocityDisplacementForceAccelerationMomentWeightHow to determine whether 20 m/s N is a vector quantity20 m/s indicates just the speed i.e magnitude20 m/s N indicates the speed i.e magnitude why the N indicates the direction.Thus, we can conclude that 20 m/s N is a vector quantity because it has both magnitude and direction.
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when a boy jumps into a pool
Answer:
energy only
Explanation:
Water waves transfer energy via oscillations of the water molecules, but the the water molecules themselves do not move along the wave.
This is why when the boy jumps into the water, his kinetic energy is transferred by the water molecules across the pool, but neither the boy nor the water particles move along with the wave.
pls the explanation of archimedes principle
Explanation:
Hello !
Archimedes' principle''states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces.''
Archimedes principle equation is given as
buoyant force = density of fluid x volume of displaced fluid x acceleration due to gravity. or
Fb=-density*gravity*volume
For example, a ship that is launched sinks into the ocean until the weight of the water it displaces is just equal to its own weight.
Answer:
Archimedes principle states that"When a body is totally or partially immersed in a liquid,it experience an upthrust which is equal to the weight of the liquid displaced"
This shows that the weight of liquid displaced when a certain object is placed in water is equal to the weight of the object.
what is the difference between an sa and an sb galaxy? (select all that apply.)
The difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
What is sa Galaxy?Sa galaxies are normal spirals that have narrow, tightly wound arms, which usually are visible because of the presence of interstellar dust and, in many cases, bright stars.
What is sb Galaxy?The arms of sb galaxy are more widely spread than those of the Sa variety and appear less smooth.
Thus, the difference between an sa and sb galaxy is Sa has a larger nucleus and more tightly wound arms than an Sb.
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Which part of the curve shows:
a. acceleration
b. zero acceleration
c. deceleration
d. zero velocity
Answer / Explanation:
acceleration is essentially increasing in velocity. [acceleration is literally velocity over time]
So, we can see acceleration on this velocity/time graph (the y-axis is representative of velocity).
Meaning that...
When we increase in velocity, that is acceleration. [A]
When we stay at the same velocity, that is zero acceleration. [B]
> (we are not increasing {acceleration} or decreasing {deceleration} in velocity/ acceleration over time)
When we decrease in velocity, that is deceleration. [C]
When we have no velocity (velocity = 0), that is zero velocity. [D]
So, this curve is already in order of A-B-C-D.
(origin/0 to A = acceleration)
(A to B = zero acceleration)
(B to C = deceleration)
(C to S = zero velocity)
hope this helps!!
Answer:
O - A : acceleration
A - B : zero acceleration
B - C : deceleration
C - S : zero velocity
Explanation:
acceleration is velocity over time, meaning that the slope of the graph is showing acceleration
B
Which actions most likely cause the domains within a material to lose their alignment and become more
randomized? Check all that apply.
heating the material
Orubbing the material against a magnet
O passing electricity around the material
O placing the material in a magnetic field of opposite polarity
O placing the material near a strong magnet
O hitting the material
Mark this and return
Next
Submit
Answer: 2, 3, and 5
Explanation:
The pendulum below swings in periodic motion between point A and point B. At which point does the pendulum have the least potential energy?
The pendulum have the least potential energy at the point C between point A and B because it is lower in height as compared to other points.
What is potential energy?Potential energy is the energy held by an object because of its position. If the object is present at a certain height, it has more potential energy as compared to object which is lower in height.
So we can conclude that the pendulum have the least potential energy at C point that is between point A and B.
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a transverse wave passes through a slinky
Last one!
Perpendicular to the wave's energy
Hope this helps!
A hiker travels 12 km in a direction of 50 degrees west of north. What are the north and west components of this displacement?
The north and west components of this displacement are 9.19 km and -7.71 km respectively.
North component of the displacement
The north component of the displacement is calculated as follows;
Dy = D sinθ
Dy = 12 km x sin50
Dy = 9.19 km
West component of the displacementDx = D x cosθ
Dx = - 12 km x cos(50)
Dx = -7.71 km
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2) A skier stands at rest and begins to ski downhill with an acceleration of 3.0 m/s² {downhill). What is
her displacement after 15.0 seconds?
Answer:
her displacement s=337.5m
Explanation:
check out the above attachment ☝️
Displacement after 15.0 seconds s= 337.5 m
What is acceleration?
The rate of change of velocity is called acceleration.
Acceleration. speed is the charge of the exchange of displacement. Acceleration is the charge of the exchange of speed. velocity is a vector quantity because it consists of each significance and direction. Acceleration is also a vector quantity as it's far just the fee of alternate of pace.
Acceleration of 3.0 m/s²
Time= 15.0 seconds
S= ut + 1/2 at²
S = 0+0.5*3*15*15
=337.5 m
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How to add two on/off switches that can change the brightness of the light in circuit a without turning it off
Answer:
ressistor
Explanation:
Assuming a current is flowing, what increases the strength of the magnetic field of a coiled electrical wire?.
Answer:The amount of current flowing
Explanation:this derives from amperes law of maxwell’s equations. It’s easiest to see in differential form. The curl of the magnetic field is proportional to the current plus the change (time derivative) in electric field
PLEASE HELP ASAP!!!
Describe the two forces that form mid-ocean ridges and ocean trenches
Ridge push refers to the pressure exerted by the excess height of the mid-ocean ridge, while Slab pull refers to the force exerted by the weight of the subducted slab on the plate it is attached to.
Two forces that form mid-ocean ridgesThe two forces that form mid-ocean ridges are ridge-push and slab pull.
What is Ridge push?Ridge push refers to the pressure exerted by the excess height of the mid-ocean ridge.
What is Slab pull?Slab pull refers to the force exerted by the weight of the subducted slab on the plate it is attached to.
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Which observations most likely led to Jenna’s conclusion?
a change of odor
a decrease in temperature
a change in moisture content
a decrease in mass
The findings that most likely contributed to Jenna's conclusion were a change in smell. Option A is correct.
What is odor?A fragrance, usually an unpleasant one: The smell of sweaty feet was palpable throughout the space. Our body odor has a big impact on the kinds of scents we enjoy.
The complete question is;
"Jenna pulled out an open bowl of leftover mashed potatoes from the fridge and smelled something different. She discovered that since the potatoes were initially placed there, chemical changes had taken place. Which facts most likely supported Jenna's judgment?
a change of odor
a decrease in temperature
a change in moisture content
a decrease in mass"
The observation that most likely inspired Jenna to draw her conclusion was a change in odor.
Hence, option A is correct.
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Answer:
A change in odor
Explanation:
A firework with a mass of 1.5 kg shoots up into the air with a velocity of 25 m/s. It then explodes. Use this information to work out the total momentum of all the pieces after the firework explodes
Answer:
37.5 kg⋅m/s
Explanation:
p = mv
p = (1.5)(25) = 37.5 kg⋅m/s
Momentum is conserved in all collisions and explosions!
calculate the heat energy required to increase the temperature of 10 kg of water from 25 degrees Celsius to 115 degrees Celsius
Answer:
3 767 400 joules
Explanation:
4.186 J/g-C is the specific heat of water
25 to 115 is 90 degrees C change
10 000 g is 10 kg of water
10 000 * 90 * 4.186 = 3 767 400 Joules
6. Yeast needs oxygen to create a chemical reaction in which of the following?
A. Aerobic reactions and anaerobic reactions.
B. Anaerobic reactions only.
C. Fermentation
D. Aerobic reactions only.
Answer:
D
Explanation:
Anaerobic Respiration only
If the current in each wire is the same, which wire produces the strongest magnetic field?.
When the sun runs out of hydrogen in its core, it will become larger and more luminous because:.
Answer:
Because the size of the star has expanded, the surface cools down and goes from white-hot to red-hot. Because the star is brighter, redder and physically larger than before, we dub these stars "red giants"
any three methods to increase efficiency of a simple machine?
Answer:
lubricant (decrease friction).
control production speed.
use only when required.
Examples of kinetic theory of convection
Answer:
example of kinetic theory include brownian motion the random movement of the particles because the consolation with the air molecules and how gas is behave boiling and j l also this cyclone explain how temperature affects the
Which planet in our solar system, discovered in 1781, was named after the greek god of the sky?.
Answer:
i think the planet is Uranus
(a) that the acceleration (A) will have no components that are identically zero. (B) may have some components that are identically zero. (C) will have only a z component that is identically zero. (D) will have an identically zero z component, and maybe an identically zero component in the x or y directio
Answer:
D.
Explanation:
acceleration in the z component = velocity in z component / time. The question states velocity in z component is zero. Therefore, acceleration in z component = 0/time = 0.
Now the question does not specify whether the other velocity vectors (x or y) is zero or not. So its D.
a quantity that has only magnitude(size) is
An astronomer wants to observe a cloud of dust in a relatively close part of the Galaxy. Unfortunately, this dust cloud is not located in the direction of a crowded region of stars. What instrument would be the most help in finding this cloud. Group of answer choices a visible-light telescope (like the Keck) with a camera or CCD detector a spectroscope that can search for the line radiation from highly ionized atoms an x-ray telescope in orbit around the Earth a sensitive infra-red telescope in orbit around the Earth
The instrument that would be the most help in finding this cloud is D. a sensitive infra-red telescope in orbit around the Earth.
What is an astronomer?It should be noted that an astronomer is a scientist who focuses on the study of the Earth.
In this case, the instrument that would be the most help in finding this cloud is a sensitive infra-red telescope in orbit around the Earth.
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A standing wave measures 0.25 m between nodes and its frequency is 1500 hz. what is the standing wave's speed?
380 m/s
750 m/s
1500 m/s
Answer:
[tex]750\; {\rm m\cdot s^{-1}}[/tex].
Explanation:
The distance between two adjacent nodes of a standing wave is equal to one-half (that is, [tex](1/2)[/tex]) the wavelength of this wave.
Let [tex]\lambda[/tex] denote the wavelength of the standing wave in this question. The distance between two nodes of this wave is [tex]0.25\; {\rm m}[/tex], meaning that [tex](1/2)\, \lambda = 0.25\; {\rm m}[/tex]. Thus, [tex]\lambda = 2 \times 0.25\; {\rm m} = 0.50\; {\rm m}[/tex].
Given that [tex]f = 1500\; {\rm Hz}[/tex] is the frequency of the waves that formed this standing wave, the speed of these waves would be:
[tex]\begin{aligned}v &= \lambda\, f \\ &= 0.50\; {\rm m} \times 1500\; {\rm Hz} \\ &= 0.50\; {\rm m} \times 1500\; {\rm s^{-1}} \\ &= 750\; {\rm m\cdot s^{-1}}\end{aligned}[/tex].
