Meg lifted a box of books with a mass of 20 kg from the floor to a shelf 1.4 m off the ground. The applied force was equal to the weight of the box of books. How much work did Meg do?

A certain battery can power a 100 ohm-resistance device for 4 hours. how long can the battery power a 200 ohm device?

Can a nickel be attracted to a magnet?

A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 32 m high. when it hits the ground at the base of the cliff, the rock has a speed of 30 m/s.

Trace the energy transformations from a hamburger you eat to riding your bike.

How did cooperation lead to devlopment of philosophy

What is mummification?

Order the steps to describe how information is sent. A signal is produced. A signal is seen, heard, or used. Radio waves are modulated and amplified. Radio waves are amplified and demodulated.

The national grid supplied a house with 18000000 J of energy in 1 hour. What was the average current supplied to the house in that hour? Write any equations that you use.

Claudia throws a baseball to her dog. Which free-body diagram shows the baseball when it's flying horizontally in midair? (Assume no air resistance.)

Which of the following substances will show the smallest change in temperature when equal amounts of energy are absorbed? water air sand concrete