Momentum
Impulse
Work
Energy
Power
100
What is the mass of a car traveling at 30 m/s if it has a momentum of 3.75 x 10^4 kgm/s?
1250 kg
100
A 3 kg rock falls for 5 s. What is the magnitude of the rock’s impulse as it hits the ground?
147 Ns
100
How much work would a child do while pulling a 9 kg wagon a distance of 6 m with a 22 N force?
132 J
100
What is the potential energy of a 75 kg man standing at the top of a 1200 ft skyscraper? (1 m = 3.21 ft)
275000 J
100
If electricity costs 8 cents per kWhr, how much would it cost you to run a 120 W stereo system for 3 hours a day for 5 weeks?
$1.01
200
A 20 kg child sitting in a 2 kg wagon is traveling at 1.3 m/s. What is the momentum of the child and wagon?
28.6 kgm/s
200
A batter applies an average force of 6000 N to a baseball for 1.3 ms. What is the magnitude of the bat’s impulse on the ball?
7.8 Ns
200
You carry a 10 kg bag of groceries at a constant speed across a 2.7 m room. How much work do you do on the bag?
0 J
200
An object hits a wall and bounces back with half of its original speed . What is the ratio of the final kinetic energy to the initial kinetic energy of the object?
1 / 4
200
How many minutes would it take a 500 W electric motor to do 150 kJ of work?
5 min
300
A 0.18 kg softball is dropped from a height of 4.0 m above the ground. What is it’s momentum just before it hits the ground?
1.69 kgm/s
300
A girl hits a stationary 0.230 kg ball and it leaves her racket at 50 m/s. The racket was in contact with the ball for 20 ms. What average force did the ball exert on the racket?
575 N
300
A child does 400 J of work while pulling a box up 3.0 m from the ground to his tree house. What is the mass of the box?
13.61 kg
300
A 64 kg man bungee jumps from the top of a 215 m platform. What is his kinetic energy when he is 30 m from the ground?
116000 J
300
How long (in hr) would a 60 W light bulb need to stay on to produce 2.7 x 10^6 J of electrical energy?
12.5 hr
400
In a ballistics test, a 4.2 g bullet traveling at 900 m/s suddenly hits and becomes embedded in a 5.0 kg wood block. What is the speed of the block immediately after the bullet hits?
0.76 m/s
400
The impulse applied to a 75 g object is 1.1 Ns causing the object to increase its speed to 20 m/s. What was the object’s initial speed?
5.3 m/s
400
When a car slows down, it applies 1.7 x 10^4 N of braking force as the engine does 5.0 x 10^5 J of work. How far does the car travel before it comes to a complete stop?
29.4 m
400
What is the kinetic energy of a 45 g golfball traveling at 41 m/s?
37.8 J
400
A 1400 kg car accelerates from rest to 30 m/s in 8 s. What is the average horsepower (hp) delivered by the engine? (1 hp = 746 W)
105 hp
500
A 0.33 kg volleyball is thrown vertically down with an initial speed of 0.25 m/s. It takes the ball 0.08 s to reach the ground. What is the magnitude of its momentum just before it hits the ground. (g = 9.8 m/s2)
0.341 kgm/s
500
A 140 g baseball is traveling at 10.0 m/s to the left when it is suddenly struck by a bat, causing it to reverse direction and travel at 8.0 m/s to the right. If the bat produced an average force of 1200 N, for how long was it in contact with the ball (in ms)?
2.1 ms
500
How much work is required to accelerate a 1200 kg car from 20 m/s to 60 m/s?
1,920,000 J
500
A 1000 kg car is moving at 20 km/hr. If a 2000 kg truck has 20 times the kinetic energy of the car, how fast (in km/hr) is the truck moving?
63.25 km/hr
500
How much work can a 22000 W car engine do in 1 minute if it is 75% efficient?
990000 J
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