100kg quarterback is travelling at 3m/s and is stopped by a tackler in 2s.

a. calculate the average force exerted by the tackler?

What force keeps our atmosphere from floating out into space? heat water gravity outgassing

Jet fighter planes are launched from aircraft carriers with the aid of their own engines and a catapult. If in the process of being launched from rest, the thrust of a jet's engines is 2.

Explain why radio waves can travel through space, but sound waves cannot. explain the behavior of sound waves and radio waves in space.

Angelina jumps off a stool. As she is falling, the Earth's gravitational force on her is larger in magnitude than the gravitational force she is exerting on the earth. 1. False 2. This may happen in many cases, but not in every case. 3. True 4.

Which of the following could cause a flash flood A. a sudden hailstorm b. slowly rising ocean tides C. melting snow in the spring D. A hurricane forming in the middle of the Atlantic

It is epistemically possible that a completed physics might include which of the following propositions? O Souls and other spiritual substances exist O God created the universe O Matter is unreal O All of the above

The weight of an object varies inversely with the second power of the distance from the center of Earth. The radius of Earth is approximately 4000 miles.

The chemical reaction of oxygen with other substances is called A. erosion. B. oxidation. C. exfoliation. D. acidification.

Find the net charge of a system consisting of 6.16*106 electrons and 7.68*106 protons. Express your answer using three significant figures. Qnet = 2.43*10-13 C

A motorist is driving at 20m/s when she sees that a traffic light 200m ahead has just turned red. She knows that this light stays red for 15s, and she wants to reach the light just as it turns green again. It takes her 1.