How do you know if an object is moving?

An automobile engine delivers 55.0 hp. How much time will it take for the engine to do 6.22 * 105 J of work? One horsepower is equal to 746 watts. Answer in units of s.

when a heavey containr is lowered from second floor of a building what kind of work is said to be done

A 20 kg bike accelerates at 10 m/s2. With what force was the person pedaling if friction exerted a force of 100N?

A monkey throws a coconut straight down from the top of a tree. At the same time, the branch he is standing on breaks. The monkey and the branch fall straight down. Which of the following is true? A. The coconut will reach the ground first B.

Earth's magnetic field can make a magnet out of an iron bar by causing the magnetic domains to

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. Is the velocity constant throughout the trip? Explain.

Why does the air pressure inside the tires of a car increase when the car is driven?

If you were to drop a clay ball and a rubber ball of the same mass from the same height, which would have a greater change of momentum after they hit the ground?

Which is a possible measurement of the momentum of a moving object? 11 kg∙m2/s2 2.8 kg∙m/s 16 kg∙m/s, due west 9.3 m/s2, due north

Let's say you had a pulley system with a mechanical advantage of 3. If you want to lift a boulder 10 meters off the ground, how far would you have to pull the rope?