Energy Review

Larry’s gravitational potential energy is 1870 J as he sits 2.20 m above the ground in a sky diving airplane. What is his gravitational potential energy when be begins to jump from the airplane at an altitude of 923 m?

• 3.29 x 10⁴ J

• 9.36 x 10² J

• 4.22 x 10⁶ J

• 1.87 x 10³ J

• 7.85 x 10⁵ J

The potential energy of a 55-kg cannon ball is 26,000 J. How high was the cannon ball to have this much potential energy?

• 50.20 cm

• 48.19 m

• Needs more information to be solved

• 48 km

Determine the elastic potential energy stored in a spring with a spring constant of 250 N/m that is compressed 28.0 cm.

• Needs more information to be solved

• 9.8 J

• 98,000 J

When a pendulum swings, at which point is potential energy at its greatest?

• 1
• 2
• 3
• 4

1. A ball has a 17 J of kinetic energy and its mechanical energy is 25 J. If the ball has a mass of 3.2 kg, what is its height above the ground?

• 0.26 m

• 0.52 m

• 5.2 m

• 25 m

If the Total Mechanical Energy is 50J, Potential Energy is 40 J, what is the Kinetic Energy?

• 1 J
• 10 J
• 90 J

You throw a ball into the air as shown in the diagram. At what point does the ball have the most potential energy?

• W

• X

• Y

• Z

When a 1.53-kilogram mass is placed on a spring with a spring constant of 30.0 newtons per meter, the spring is compressed 0.500 meter. How much energy is stored in the spring?

• 3.75 J

• 7.50 J

• 15.0 J

• 30.0 J

A spring extends 1.5m under load 10N. What is its spring constant?

• 0.15N/m
• 10N/m
• 6.7N/m
• 15N/m

A 70 kg runner has a velocity of 5 m/s. Her kinetic energy is

• 875 J
• 175 J
• 1750 J
• 350 J