Physics Questions - English Form

An object is thrown with a horizontal velocity of 20 m/s from a cliff that is 125m above ground level. If air resistance is negligible, what is the time it takes the object to fall to the ground from the cliff?

What must be your average speed in order to travel 230km in 3.25hr?

A bowling ball traveling with constant speed hits the pins at the end of a bowling lane 16.5m long. The bowler hears the sound of the ball hitting the pins 2.50s after the ball is released from his hands. What is the speed of the ball? The speed of sound is 340m/s

A sports car is advertised to be able to stop in a distance of 50m from a speed of 90km/h. What is its acceleration in m/s^2? How many g's is this(g = 9.80 m/s^2)?

A speeding motorist traveling 120km/h passes a stationary police officer. The officer immediately begins pursuit at a constant acceleration of 10.0 km/h/s(note the mixed units). How much time will it take for the police officer to reach the speeder, assuming that the speeder maintains a constant speed? How fast will the police officer be traveling at this time?

A stone is thrown vertically upward with a speed of 12.0m/s from the edge of a cliff 75.0m high(Fig. 2-32).

(a) How much later does it reach the bottom of the cliff?

(b) What is its speed just before hitting?

(c) What total distance did it travel?

The acceleration due to gravity on the Moon is about one sixth what it is on Earth. If an object is thrown vertically upward on the Moon, how many times higher will it go than it would on Earth, assuming the same initial velocity?

A 90m long train begins uniform acceleration from rest. The front of the train has a speed of 20m/s when it passes a railway worker who is standing 180m from where the front of the train started. What will be the speed of the last car as it passes the worker?

A diver running 1.6m/s dives out horizontally from the edge of a vertical cliff and reaches the water below 3.0s later. How high was the cliff and how far from its base did the diver hit the water?

What is the weight of a 66kg astronaut

(a) on Earth

(b) on the Moon (g=1.7m/s^2)

(c) on Mars (6=3.7m/s^2)

(d) in outer space traveling with constant velocity?

What average force is required to stop an 1100kg car is 8.0 seconds if it is traveling at 90km/h?

A 0.140kg baseball traveling at 45m/s strikes the catcher's mitt, which, in bringing the ball to rest, recoils backwards 11.0cm. What was the average force applied by the ball on the grove?

An object is released from rest on a planet that has no atmosphere. The object falls freely for 3.0 meters in the first second. What is the magnitude of the acceleration due to gravity on the planet?

1. 1.5 m/s/s

2. 3.0 m/s/s

3. 6.0 m/s/s

4. 10.0 m/s/s

5. 12.0 m/s/s

If Spacecraft X has twice the mass of Spacecraft Y, then true statements about X and Y include which of the following?

I. On Earth, X experiences twice the gravitational force that Y experiences.

II. On the Moon, X has twice the weight of Y.

III. When both are in the same circular orbit, X has twice the centripetal acceleration of Y.

1. I only

2. III only

3. I and II only

4. II and III only

5. I, II, and III

A block of mass 3*m can move without friction on a horizontal table. This block is attached to another block of mass m by a cord that passes over a frictionless pulley, as shown above. If the masses of the cord and the pulley are negligible, what is the magnitude of the acceleration of the descending block?

1. Zero

2. g/4

3. g/3

4. 2*g/3

5. g

A plane 5 meters in length is inclined at an angle of 37 degrees, as shown above. A block of weight 20 newtons is placed at the top of the plane and allowed to slide down.

The mass of the block is most nearly

1. 1.0 kg

2. 1.2 kg

3. 1.6 kg

4. 2.0 kg

5. 2.5 kg

A plane 5 meters in length is inclined at an angle of 37 degrees, as shown above. A block of weight 20 newtons is placed at the top of the plane and allowed to slide down.

The magnitude of the normal force exerted on the block by the plane is most nearly

1. 10 N

2. 12 N

3. 16 N

4. 20 N

5. 33 N

A rock of mass m is thrown horizontally off a building from a height h, as shown above. The speed of the rock as it leaves the thrower's hand at the edge of the building is v0.

How much time does it take the rock to travel from the edge of the building to the ground?

1. sqrt(h*v0)

2. h/v0

3. h*v0/g

4. 2*h/g

5. sqrt(2*h/g)

What must be your average speed in order to travel 230km in 3.25hr?

A bird can fly 25km/h. How long does it take to fly 15km?

If you are driving 110km/h along a straight road and you look to the side for 2.0 seconds, how far do you travel during this inattentive period?

A car accelerates from 12m/s to 25m/s in 6.0 seconds. What was its acceleration? How far did it travel in this time? Assume constant acceleration.

A car slows down from 20m/s to rest in a distance of 85m. What was its acceleration, assumed constant?

A light plane must reach a speed of 30m/s for takeoff. How long a runway is needed if the (constant) acceleration is 3.0m/s^2?

A tiger leaps horizontally from a 7.5m high rock with a speed of 4.5m/s. How far from the base of the rock will she land?

A ball thrown horizontally from the roof of a building 56m tall and lands 45 m from the base. What was the ball's initial speed?