Physics: Energy

What is the SI unit of energy?

• meter per second (m/s)

• newton (N)

• meter per second squared (m/s^2)

• joule (J)

How much work is done on a shopping cart if a person exerts a constant force of 50.0 N at an angle 20.0° below the horizontal and pushes the mower 80.0 m on level ground?

• 80,000 J

• 3,760 J

• 8,240 J

• 12,200 J

A 100.0-kg person climbs stairs, gaining 30.0 meters in height. Find the work done to accomplish this task.

• 29,400 J

• 3,000 J

• 72,100 J

• 4,500 J

The bald eagle can reach a speed of up to 144 km/h. Calculate the kinetic energy of a 4.5 kg eagle flying at such speed.

• 5760 J

• 648 J

• 3600 J

• 46,656 J

How fast should a 3000-kg animal move to have a kinetic energy of six thousand joules?

• 4.0 m/s

• 3.5 m/s

• 1.8 m/s

• 2.0 m/s