Almost all of the electricity that people use is

produced by

1. motors.

2. batteries.

3. transformers.

4. generators.

A stone is thrown horizontally at a velocity of 12.90 m/s from a tree house that is located 73.2 m above the ground in a beautiful redwood tree. What is the stone's horizontal component of velocity just before it hits the ground?

You and a friend are jumping on a trampoline. Why does Earth, which is rapidly orbiting around the sun, not move under your feet when you jump? A.

Why are asteroids mostly irregular in shape? Because their gravity pulls everything towards the center of the asteroid Because their gravity deforms the rocks present on their surface Because they have more mass than planets and therefore more

The temp of some water with a mass of 10.0 g and a specific heat of 4.2 changed from 25.0 ' C to 35.0 ' C. How much heat was absorbed? A) 100 J B) 230 J C) 420 J D) 600 J

A net force of 100 Newton's is applied to a wagon for 3 seconds. This causes the wagon to undergo a change in momentum of?

How would life on earth be different if earth's axis were not tilted with respect to its orbit? A. There would be no seasons. B. There would be no day and night. C. All places would have the same climate. D. The seasons would be much shorter.

What will a spring scale read for the weight of a 75.0-kg woman in an elevator that moves upward with constant speed of 5.8 m/s?

What's the definition of: • cellular respiration • photosynthesis

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above

You have an open air column of length 1.40 m in air at 24.2 °C. What is the frequency of the third harmonic?