Answer to Question #160801 in Physics for Gavin

Question #160801

A rock is lying at the top of a 2 m high cliff and it possesses a potential energy of 80 J. What is the mass of the rock?

Expert's answer

By the definition of the potential energy, we have:

"PE=mgh,""m=\\dfrac{PE}{gh}=\\dfrac{80\\ J}{9.8\\ \\dfrac{m}{s^2}\\cdot2\\ m}=4.08\\ kg."

Learn more about our help with Assignments: Physics

Comments

No comments. Be the first!

Leave a comment

Related Questions

1. A 50 kg shell is fired from a cannon on Earth's surface with a potential energy of 196,000 J.
2. One of the performance characteristics of a car is the time needed to accelerate from 0 km·h-1to 10
3. A student walks across campus from the residence hall to the science lab in 18 minutes. The science
4. A stone is thrown vertically up with a speed of 14 m/s, and at that moment it had 37 kJ of kinetic e
5. A child compresses his spring gun 1 cm. If 3 mJ of energy are stored in the spring, what is the spri
6. A 50 kg skydiver loses 2400 kJ of energy during a jump. What was her change in height?
7. On Planet X a 0.5 kg space rock falls a distance of 2.5 meters and loses 20 J of energy. What is t