Energy, Work, and Power

What is the correct equation for gravitational potential energy

• m x g x h

• m x g / h

• m x h / g

What is the correct equation for kinetic energy

• 1/2 x m x v²

• m x v²

• 1 / 2 x v x m²

• A

• B

• C

• D

• A

• B

• C

• D

Four students run up the stairs in the time shown. Which student has the largest power output?

• A

• B

• C

• D

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

• 150 J

• 0

• Can’t tell without knowing the mass of the ball

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

• -18 J

• -10 J

• -8 J

• -2 J

If the mass of the cart is 15kg, how much is the potential energy of the cart?

• 0J

• 1.2J

• 6J

• 58.8J

A motor exerts a force of 200 N to lift an object vertically upward a distance of 5 meters in 2 seconds. What is the power developed by the motor?

• A) 50 W

• B) 200 W

• C) 500 W

• D) 2,000 W

How much energy is dissipated as thermal energy?

• A) 250 J

• B) 500 J

• C) 2000 J

• D) 2500 J