A 20-kg rock sits atop a 30 meter cliff. How much potential energy does it have?

What is the best way to describe the rate of motion of an object that changes speed several times over a period of time is to calculate

There are elements in the surface of the sun that do not exist on earth. true false

A skier halfway between the top and bottom of a hill. Which statement best describes the skier?

At 8:00 AM you leave home and walk. 5km to your friends house. at 11:30AM you return home, then tavel by car to the mall, which is 10km away, and arrive at 11:45AM. what is the total distance traveled

Choose the correct statements. A. Bond formation is exothermic. B. Bond breaking is exothermic. C. Bond breaking is endothermic. D. Bond formation is endothermic.

Wright true or false: 1. A baseball has more momentum than a tennis ball traveling at the same speed. 2. A light ball has more inertia than a heavy ball 3. The less momentum a bowling ball has, the easier it is for that ball to knock down pins. 4.

The interference of two sound waves of slightly different frequencies produces

8. A force of 80 pounds on a rope is used to pull a box up a ramp inclined at 100 from the horizontal. The rope forms an angle of 330 with the horizontal. How much work is done pulling the box 25 feet along the ramp?

A raindrop has a mass of 5.4 * 10-7 kg and is falling near the surface of the earth. Calculate the magnitude of the gravitational force exerted (a) on the raindrop by the earth and (b) on the earth by the raindrop.

As an astronaut travels towards Earth, her weight A. decreases because gravity decreases. B. decreases because her mass decreases. C. increases because gravity increases. D. remains the same because her mass remains the same.