Review Packet

If a 60 kg diver is on a 9.2 m diving board, what is the diver’s potential energy?

• 2016J

• 550 J

• 5409.6 J

• 6321 J

A 70-kg runner possesses 3122 J of kinetic energy while running down a straight away. The runner’s velocity is:

• 6.68 m/s

• 9.44 m/s

• 0.21 m/s

• 0.15 m/s

A 0.5-kg model roller coaster is released from rest from its first drop. Its velocity at the very bottom is measured to be 10 m/s. What was the height of its first drop?

• 72 m

• 7.3 m

• 144 m

• 5.1 m

At which point is the kinetic energy the greatest?

• X

• Y

• Z

• W

The base units that make up a joule are: a. kg m^2/s^2 b. kg m/s^2 c. mg d. N

• kg m^2/s^2

• kg m/s^2

• mg

• N

An 80-kg skateboarder rolls down a ramp that’s 16m tall and stretches a horizontal distance of 12 meters before reaching the ground. The coefficient of friction between the skateboard and the ramp is measured to be 0.21. What is the potential energy at the top of the hill?

• 12,544 J

• 1,280 J

• 784 J

• 16,000 J

What are the thermal losses from friction when the skater reaches the bottom of the hill?

• 10 Joules

• 20 Joules

• 30 Joules

• 40 Joules

An 80-kg skateboarder rolls down a ramp that’s 16m tall and stretches a horizontal distance of 12 meters before reaching the ground. The coefficient of friction between the skateboard and the ramp is measured to be 0.21. What is the kinetic energy and velocity at the bottom of the hill?

• Kinetic Energy: 10000.00 J, Velocity: 15.8 m/s

• Kinetic Energy: 11245.11 J, Velocity: 16.8 m/s

• Kinetic Energy: 10568.32 J, Velocity: 16.3 m/s

• Kinetic Energy: 8000 J, Velocity: 25 m/s

A 500-kg roller coaster drops from an initial height of 70 m and travels a horizontal distance of 62m. If the roller coaster comes to a complete stop on the second hiss at 50 m, what is the coefficient of friction between the roller coaster and the track?

• 0.1

• 0.2

• 0.3

• 0.4