515 Answered Questions for the topic AP physics

Ap Physics Physics Momentum

01/16/16

A 500 kg car is moving at 40 m/s. What is the impulse needed to stop this car?
I found the momentum (20,000 ns)   the other things the question asks is: if this car takes 15 sec to stop, what is the average braking force? what is the time rate of change in momentum?
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01/05/16

AP Physics (rotational motion question)
The drum shown in the figure has a radius of .4 meters and a moment of inertia of 2.3 kgm^2 about an axis perpendicular to it through its center. The frictional torque at the drum axle is 3 Nm. A... more
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Ap Physics Physics

01/04/16

physics homework problem on impulse
A punter drops a ball from rest vertically 1 meter down onto his foot. The ball leaves the foot with a speed of 18 m/s at an angle 55º above the horizontal. What is the impulse delivered by the... more
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Ap Physics

12/28/15

with an initial speed of 8.0 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1.0 meters above the ground. See full question below.
A child throws a ball with an initial speed of 8.0 m/s at an angle of 40 degrees above the horizontal. The ball leaves her hand 1.0 meters above the ground. At what angle below the horizontal does... more
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Ap Physics Physics Science

11/20/15

how many moles of gas?
A gas with an initial temperature of 790 °C undergoes an isobaric process . Final temp = 81.3 CA) How many moles of gas are there?   Hint:You must use Pascal for pressure and cubic meters for... more
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Ap Physics

10/22/15

A ship is 50m away, assuming we drop the cannon ball vertically 4m, how much time will it take?
The ship we are attempting to hit is 50 meters away 
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Ap Physics

09/20/15

At what time do they collide in terms of D, Vo, and a
At a certain instant in time a toy car is traveling at a constant speed of Vo to the right while a distance D ahead is another toy car starting from rest and traveling to the left with constant... more
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Ap Physics

09/20/15

What is the speed of the car just as it passes the train
A train is moving parallel and adjacent to a highway with a constant speed of 34 m/s. Initially a car is 29 m behind the train traveling the same direction as the train at 46 m/s and accelerating... more
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Ap Physics

09/20/15

If his reaction time is 2.16333s how fast will he be traveling when he reaches the deer
A motorist traveling at 14m/s encounters a deer in the road 42 m ahead  If the maximum acceleration the vehicles brakes are capable of is -6m/s squared  What is the maximum reaction time of the... more
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Ap Physics

09/18/15

a steel ball is dropped onto a hard floor from a height of 1.30 m and rebounds to a height of 1.25 m. calculate its velocity just before it strikes the floor
a steel ball is dropped onto a hard floor from a height of 1.30 m and rebounds to a height of 1.25 m. calculate its velocity just before it strikes the floor
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05/19/15

Three high school physics problems please help!
1. The Milky Way contains a supermassive black hole with mass of 4 million times the Sun(!). a. If the black hole is 2.4x10^20 away from Earth, calculate the gravitational force between the black... more
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Ap Physics

03/08/15

physics help please
A beam resting on two pivots has a length of L = 6.00 m and mass M = 87.0 kg. The pivot under the left end exerts a normal force n1 on the beam, and the second pivot placed a distance l = 4.00 m... more
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Ap Physics

11/17/14

A rocket skateboard of mass 3.00 kg has an initial velocity of (5.00, 2.50) m/s. A net force of (3.40, 2.67) N is applied to it for 10.0 s. what's the velocity?
Its asking for the velocity at the end of the time but i have never encountered two velocities and forces together inside parantheses
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10/22/14

How long does the pinball sit in its area?
A pinball is moving through a pinball machine at 1 m/s and hits an accelerator. When it leaves the accelerator, it is traveling at 2 m/s over the distance of 2.7 cm. How long is the pinball in the... more
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Ap Physics

04/07/14

An object moves with a constant acceleration of 5 m/s squared which of the following statements is true
A. Just velocity stays the same b. it moves 5 m each second c. Objects velocity changes 5 m/s each Second
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