Physics final worksheet review

A 3.0 kg toy dump truck moving with a speed of 2.0 m/s starts up a ramp. How high does the truck roll before it stops assuming we ignore motional kinetic energy converted to thermal energy from friction?

.203m

A 5 N force causes a spring to stretch .2 meter. What is the potential energy stored in the stretched spring?

.5 J

Two weightlifters, one 1.5 meters tall and one 2.0 meters tall, raise identical 50.-kilogram masses above their heads. Compared to the work done by the weightlifter who is 1.5 meters tall, the work done by the weightlifter who is 2.0 meters tall is

greater

A 3.0g bullet moving at 2.0 km/s strikes an 8.0 kg wooden block at rest on a frictionless table. The bullet passes through the block and emerges on the other side with a speed of 5.0 X 10^2m/s. How fast is the block moving after the collision?

.56 m/s

A .34 kg glider on an air track moving at 1.5 m/s collides with a .51 kg glider that is initially at rest. They collide and stick together. How fast are the two gliders moving after the collision?

.6 m/s

A 3.0 g bullet at 2.0 km/s strikes an 8.0 kg wooden block at rest on a frictionless table. the bullet lodges in the wooden block. how fast does the block move on the table after being struck?

.75 m/s

A 10 N force is required to hold a stretched spring .20 meter from its rest position. What is the potential energy stored in the stretched spring?

1.0 J

A student does 60 Joules of work pushing a 3.0 kg box up the full length of a ramp that is 5.0 meters long. What is the magnitude of the force applied to the box to do this work?

12 N

How fast must a 20.0 kg child be moving on her tricycle to have the same momentum as a 1.20 x10^3 kg car traveling at 2.00 m/s?

120 m/s

A 74 kg student, starting from rest, slides down an 11.8 meter high water slide. How fast is he going at the bottom of the slide?

15.22 m/s

If a 1.00 x10^2 kg car is sent towards a cement wall with a speed of 14.0 m/s and the impact stops the car in 8.00 x 10^-2s, with what force was it brought to rest?

17500N

Mass = 65 kg Radius = 2.5 m velocity = 8.6 m/s Find centripetal force

1922.96 N

Determine the mechanical energy of a 450 kg roller coaster moving at 30 m/s at the bottom of the first dip which is 15 meters above the ground.

268717 J

A 5.0 kg bucket of water is being swung in a horizontal circle of .70 meter radius at a constant speed of 2.0 m/s. Find the magnitude of the centripetal force on the bucket of water.

28.6 N

A 40 kg student runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. the students power outlet is

280 W

A 50 kg rock rolls off the edge of a cliff. If it is traveling at a speed of 24.2 m/s when it hits the ground, what is the height of the cliff assuming we ignore motional kinetic energy converted to thermal energy from air friction?

29.85 m

A baby and a stroller have a total mass of 20 kg. A force of 36 Newtons keeps the stroller moving in a circular path with a radius of 5.0 meters. Calculate the speed at which the stroller moves around the curve.

3 m/s

A 2.0 kg ball rolling along a flat surface starts up a hill. if the ball reaches a height of .063 meters, what was its initial speed?

3.52 m/s

A 1.0 x 10^4 kg freight car is rolling along a track at 3.0 m/s. Calculate the time needed for a force of 1.0 x 10^2 N to stop the car.

300s

A 500 kg roller coaster starts from rest at the top of an 80.0 m hill. What is its speed at the bottom of this hill assl kaontiming we ignore mo

39.52 m/s B) 196200 J

Centripetal force Fc acts on a car going around a curve. If the speed of the car were twice as great, the magnitude of the centripetal force necessary to keep the car moving in the same path would be

4 Fc

A 25.0 kg boy is sliding on a frictionless frozen lake at 5.00 m/s to the north when he is struck by a 1.00 kg snowball moving at 15.0 ms from the west. If the snowball sticks to him, how fast, and in what direction, does the boy move after the collision?

4.84 m/s

A motor used 120 watts of power to raise a 15 N object in 5.0 seconds. Through what vertical distance was the object raised?

40 M

A .20 kg object moves in a horizontal circular path with a radius of .25 meter at a constant speed of 4.0 m/s. What is the magnitude of the object's acceleration?

64 m/s

Sarah is walking down the street at 4.0 km/hr. If she has a mass of 60.0 kg, what is her momentum?

66.7 N/s

The spring of a toy car is wound by pushing the car backward with an average force of 15 newtons through a distance of .50 meter. How much elastic potential energy is stored in the car's spring during this process?

7.5 J

A 59 kg man has a total mechanical energy of 150023 J. If he is swinging downward and is currently 2.6 m above the ground, what is his speed?

70.95 m/s

A boat weighing 900 N requires a horizontal force of 600 N to move it across the water at 15 m/s. The boats engine must provide energy at the rate of

9.0 x 10^3 W

A 2.0 kg ball is tossed straight up with a motional kinetic energy of 196 Joules. How high does it go assuming we ignore motional kinetic energy converted to thermal energy from air friction?

9.99 m

Calculate the kinetic energy of a 750 kg compact car moving at 50 m/s

937500 J

Julie has a mass of 49 kg. What is her potential energy when standing on the 6 meter diving board? (She is 6 meters above the water) Julie jumps off the diving board. A) What is her kinetic energy just before she hits the water? B) What is Julie's speed just as she hits the water?

A) 2884.25 J B) 20.85 m/s

A 5kg object is moving downward at a speed of 12 m/s. If it is currently 2.6 m above the ground. A) What is its kinetic energy? B) What is its potential energy? C) what is its mechanical energy?

A) 360 J B) 127.53 J C) 487.53 J

On April 15, 1912; the luxury cruise liner Titanic sank after running into an iceberg. A) What momentum would the 4.23 x10^8 kg ship have imparted on the iceberg if it hit it head on with a speed of 11.6 m/s? B) If the captain of the ship had seen the iceberg a kilometer ahead and had tried to slow down, use the idea of impulse to explain why this would have been a futile effort?

A) 4.9 x10^9 N/s B) Given the time needed to slow down, the captain would have had to have seen the iceberg earlier in order to really slow down or half the momentum.

Michelle, who has a mass of 60.0 kg, is riding at 35.0 m/s in her sports car when she must suddenly slam on the brakes to avoid hitting a dog crossing the road. She is wearing her seat belt, which brings her to a stop in .400s. What force was produced by the seatbelt on Michelle? If she had not been wearing her seatbelt and the windshield had stopped her head in 1.00 x10^-3 what force would the windshield have produced on her head? How many times greater is the stopping force of the windshield than a seatbelt?

A) 5250 N B) 2100000 N c) 400 times

An object has a mechanical energy of 1575 J and a potential energy of 1265 J. A) What is the Kinetic energy of the object? B) If the mass of the object is 12 kg, what is its speed? C) How high above the ground is the object?

A). 310 J B) 7.19 m/s C) 10.75 m

The Magnitude of the centripetal force acting on an object traveling in a horizontal circular path will decrease if the A. Radius of the path is increased B. Mass of the object is increased C. direction of motion of the object is reversed D. Speed of the object is increased

A. Radius of the path is increased

one watt is equivalent to one

J/s

Which combination of fundamental units can be used to express the amount of work done on an object?

N-m

The work done in accelerating an object along a frictionless horizontal surface is equal to change in the object's A. Momentum B. Velocity C. Potential energy D. Kinetic Energy

Potential Energy

A go cart travels around a flat, horizontal, circular track with a radius of 25 meters. The mass of the go-cart with the rider is 200 kg. The magnitude of the maximum centripetal force exerted by the track on the go cart is 1200 N. A) What is the maximum speed the 200 kg go cart can travel without sliding off the track? B) Which change would increase the maximum speed at which the go-cart can travel without sliding off the track?

increase the radius of the track

The graph below represents the relationship between the work done by a student running up a flight of stairs and the time of ascent. A) impulse B) Momentum c)Speed D) power

power

A child is riding on a merry-go-round. As the speed of the merry-go-round is doubled, what happens to the magnitude of the centripetal force acting on the child?

quadrupled