AP Physics Sem 1 Review

1.5 m/s

A 10 kg object at rest explodes into four pieces. Each of these pieces travel due south, due east and due west, respectively, at 3 m/s. What is the magnitude of velocity of the remaining piece?

4 m/s

A 15 kg mass moving at 8 m/s collides elastically with a 5 kg mass at rest. What is the speed of the 15 kg mass after the collision?

8 N/m

A 2 kg ball compresses a spring .1 meters and is released from rest. If the ball leaves the spring at a speed of .2 m/s, what is the value of the spring constant?

7 m/s

A 45 kg object slides down an uneven frictionless incline from rest without rotating. What is its speed after it travels 2.5 meters vertically?

1.7 N

A 5 kg object has a momentum of 15 kg m/s. What is the net force required to accelerate the object to 8 m/s over 15 seconds?

85.8 degrees

A 6 kg weight is pulled from two massless ropes as seen on page 51. At what angle with respect to the x axis is the resultant force?

12 m/s2

A 6 kg weight is pulled from two massless ropes as seen on page 51. What is the magnitude of acceleration at which the object moves?

71.8 N

A 6 kg weight is pulled from two massless ropes as seen on page 51. What is the magnitude of the resultant force?

180 m

A ball is thrown horizontally out the window of a building with a velocity of 8 m/s from a height of 2500 m. How far from the base of the building will the ball land?

0.78 s

A bullet fired horizontally from a height of three meters with a velocity of 120 m/s will hit the ground after how many seconds

8 degrees

A plane is heading to a destination 1750 km due north at 175 km/h in a westward wind blowing 25 km/h. At what angle from north should the plane be oriented so that it reaches its destination?

250 km

A plane is heading to a destination 1750 km due north at 175 km/h in a westward wind blowing 25 km/h. Without the compensatory angle described in question 6, how far off course will the plane be after it has traveled 1750 km north?

177 km/h

A plane is heading to a destination 1750 km due north at 175 km/h in a westward wind blowing 25 km/h. Without the compensatory angle described in question 6, what will be the magnitude of the velocity vector?

-3pi rad/s2

A point on a rotating disc has a frequency of 120 Hz. What is the angular acceleration of the point for it to be moving at 30 Hz in 1 minute?

45 degrees

A possible angle that a vector with a magnitude of 17 m could make with the x axis so that its horizontal component is 12 m is:

18 s

A spherical marble of radius 3 cm rolls from rest with an angular acceleration of 4 rad/s2. How long will it take for it to roll 100 revolutions?

1650 J

According to an object's distance vs. force (parallel) graph, what is the work done in this process as the object moves from 2 m to 8 m as seen on page 63?

1.75 s

Assuming negligible air resistance, how long will it take for a sphere to fall 36.0 meters if thrown downward at 12.0 m/s?

0 m/s

At its maximum height, the vertical component of velocity for an abject projected at 4.9 m/s at a 60 degree angle is:

8.3 x10^-5 m

At what distance will two 1000 kg masses have the same attractive force for each other as gravity at the surface of the Earth would have on either one of them?

14 m/s

At what velocity should a ball be thrown at a 45 degree angle so that it hits a target that is 20 meters away and placed at the same height?

63.4 N

For a 5 kg object on a horizontal surface that has a coefficient of static friction where u-static = .15 and a coefficient of kinetic friction where u-kinetic = .07, what is the parallel force necessary to accelerate the object at 12 m/s2?

73.5 N

For a 7.5 kg object on a horizontal surface that has a coefficient of static friction where u-static = 1, and a coefficient of kinetic friction where u-kinetic = .8, the maximum parallel force which will not set the object in motion is:

.245 rad/s2

For a pulley of radius 76 cm with a moment of inertia of 46.5 kgm^2, a rope wrapped around it is pulled with a force of 15 N. What is the magnitude of angular acceleration.

3 V^2/2g

For an object sliding down a frictionless uneven incline without rolling, which of the following represents the change in height necessary for its velocity to double in terms of its initial velocity V?

7

For an object that travels 20 kilometers north and then 15 kilometers south, what is the ratio of the distance traveled to the displacement?

0

For an object that travels 60 meters east and then 60 meters west in fifteen minutes, what is the ratio of average velocity to average speed?

10 seconds

How long does it take a car accelerating constantly at 4 m/s2 from rest to travel 200 meters?

690 J

How much energy is lost when a .1 kg projectile traveling at 120 m/s becomes imbedded in a 2 kg block initially at rest.

2400 J

How much work must be done on a 27.5 kg object to move it 18 m up a 30 degree incline?

62 N

In an ideal situation, the force required to keep a 20 gram sphere turning at 15 revolutions per second at the end of a 35 cm string of negligible mass is:

II only

In an inelastic collision in which there are no net nonzero external forces, which of the following are NOT true? I Total vector momentum is conserved II Kinetic energy is conserved III Total energy is conserved

II and III only

In which of the following situations can the velocity and acceleration vectors be perpendicular? I An object falling vertically II An object in uniform circular motion III An object in projectile motion

II and III

The units of hertz are equivalent to: I radian/second II Revolutions/second III s^-1

3 rad/s

Two 35 kg weights are each initially halfway from the center to the endpoints of a massless 1 meter rod as shown on page 78, rotating around the rod's center at 12 rad/s. If the weights shift to the endpoints of the rod, what is the new angular velocity?

98%

Two equally weighted objects are moving in opposite directions, one at 4 m/s and the other at 3 m/s. They collide inelastically and stick together. What percentage of the kinetic energy is lost in the collision?

v/4

Two equally weighted objects of mass m are moving in opposite directions, one with half the velocity of the other. If they collide and stick together, what is the resultant velocity in terms of the faster object's velocity, v?

1.5pi rad/s

What is the angular velocity of a point on an object in uniform rotational motion that has a frequency of 45 revolutions per minute?

45 N

What is the attractive force between the Earth and an 85 kg piece of debris in an orbit of radius 27,500 km with two revolutions per day?

860 W

What is the average power necessary to move a 35 kg block up a frictionless 30 degree incline at 5 m/s?

257 m/s

What is the average velocity of an object that travels for 20 seconds with a starting velocity of 7 m/s with a constant acceleration of 25 m/s2?

39 m/s2 inward

What is the centripetal acceleration of an object in uniform circular motion at the end of a 1 meter rope making 1 revolution per second?

square root of 3

What is the coefficient of friction for a 50 kg block descending a 60 degree incline at a constant velocity?

32 m/s

What is the final velocity of an object constantly accelerating from rest at 14.5 m/s2 over 35 meters?

59 N

What is the force of friction as a 12 kg object slides for 30 meters down a 30 degree incline at a constant velocity?

7.4 x 10^-6 rev/s

What is the frequency of a planet around a star in orbit at a mean distance of R, if it is twice the mean distance of a planet orbiting the same star with a frequency of 2.1 x 10^-5 rev/s?

90 kgm/s

What is the linear momentum of a 15 kg object traveling at a constant velocity that has 270 J of kinetic energy?

9.8 m/s2

What is the magnitude of acceleration after 1.5 seconds of a sphere thrown upward from a height of 13 meters at 20 m/s2?

26 kgm/s

What is the magnitude of the average impulse of a wall on a 525 gram ball that strikes horizontally at 25 m/s and rebounds horizontally at 25 m/s?

234 m/s2

What is the magnitude of the total linear acceleration of a particle 12 cm from the axis of rotation and rotating with an angular velocity of 44 rad/s and an angular acceleration of 250 rad/s2?

1800 m/s

What is the magnitude of velocity of an object after free falling from rest after 3 minutes?

40 m/s

What is the minimum positive initial velocity necessary for an object to be launched from ground level so that it reaches a height of 80 meters?

1.8 x 10^5 N

What is the net force required for a 1.5 x 10^5 kg train car to move from 20 km/h to 60 km/h over 100 meters?

4800 N

What is the normal force for a 500 kg object on a planet that has twice the force of gravity present on the Earth?

29 hours

What is the period of a 1500 kg satellite in a circular orbit 48,000 km from the center of the Earth?

0.53 s

What is the period of an object in uniform circular motion with a radius of 25 cm with a centripetal acceleration of 35 m/s2?

20,000 m/s2

What is the radial acceleration of an object at a point 25 m from the axis of rotation that has a radius and a period of .22 seconds?

1:1

What is the ratio of angular velocities on a rotating body at a point half a radius away from its axis of rotation to a point a radius away?

2/v

What is the ratio of the momentum and the kinetic energy for a body traveling horizontally at a constant velocity?

piR/7,200 m/s

What is the speed of a moon with a period of 20 hours that is orbiting a planet of radius R at a distance 5 R from the planet's center?

32 m

What is the vertical component of a 33 m vector that is at a 76 degree angle with the x axis

1100 N

What is the weight of a 55 kg object on a planet that has twice the force of gravity present on the earth?

-890 J

What is the work done by friction on a 15 kg object pulled horizontally in a straight line for 15 meters, if the coefficient of friction between the object and the surface is given by u-kinetic = .4?

-2.9 x 10^8 J

What is the work done to slow a 1.8 x 10^5 kg train car from 60 m/s to 20 m/s?

29 degrees south of west

What vector represents the displacement of a person who walks 15 km at 45 degrees south of east, then 30 km due west?

9.16 m/s2

What would be the value of the acceleration of gravity near the surface of the Earth if the Earth had the same mass and a radius of:

II and III only

Which of the following are equivalent units for the spring constant, k? I Nm2 II kg/s2 III J/m2

I and II

Which of the following values are vectors I. Instantaneous velocity II. Distance traveled III. Average acceleration

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