Energy Math

A 4 kg rock is sitting 5 m above the ground.  How much potential energy does it have?

• 20J
• 50J
• 196J
• 980J

Tags

NGSS.HS-PS3-2

What is the kinetic energy of a 130 kg bicycle/bicyclist traveling at 3 m/s?

• 540 J
• 585 J
• 390 J
• 3820 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

How much kinetic energy does a 100 kg person have when he runs at 10 m/s?

• 50 J
• 500 J
• 5000 J
• 10000 J

Tags

NGSS.HS-PS3-2

The peak of the extinct volcano Volcano Chimborazo in Ecuador is the farthest point on Earth from Earth’s center.  This is because Earth bulges outward due to its rotation, and this bulge is greatest at the equator, which is only about 100km north of Chimborazo.  Volcano Chimborazo’s summit is 6267m above sea level.  If a mountain climber with a mass of 85kg (climbing equipment included) reaches the mountain’s peak, what is the gravitational potential energy associated with the climber with respect to sea level?

• 532695 J
• 6361.8 J
• 5220411 J
• 722.54 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A cheetah can run briefly with a speed of 31m/s.  Suppose a cheetah with a mass of 47 kg runs at this speed.  What is the cheetah’s kinetic energy?

• 22583.5 J
• 728.5 J
• 1457 J
• 0.75 J

Tags

NGSS.HS-PS3-2

One of the tallest radio towers is in Fargo, North Dakota.  The tower is 639m tall, or about 44 percent taller than the Sears Tower in Chicago.  If a bird lands on top of the radio tower, so that the gravitational potential energy associated with the bird is 2033J, what is its mass?

• 3.08 kg
• 31.17 kg
• 0.32 kg
• 13.13 kg

In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump.  The gravitational potential energy associated with Sotomayor’s jump was 1970J.  Sotomayor’s mass was 82kg.  How high did he jump?

• 237.3 m
• 15.83 km
• 24 m
• 2.45 m

Tags

NGSS.HS-PS2-4

The kinetic energy of a golf ball is measured to be 143.3J.  If the golf ball has a mass of about 47g, what is its speed?

• 78.1 m/s
• 2.46 m/s
• 1.52 m/s
• 6.09 m/s

Tags

NGSS.HS-PS3-1