A 60-kg teenager is standing on a skateboard. What force does the skateboard exert on the

teenager?

When you are running, there is friction between your feet and the ground and air resistance between your body and the air.

What are electric motors?

What type of wave can br up to kilometers long?

Suppose you are in an elevator car when the elevator cable breaks. Which of the following correctly describes what happens and why. A. You float weightlessly within the elevator car because Earth's gravity is no longer tugging on you. B.

A mass of 0.450 kg rotates at constant speed with a period of 1.45 s at a radius R of 0.140 m in the apparatus used in this laboratory. What is the rotation period for a mass of 0.550 kg at the same radius

A 10.0-µF capacitor is charged so that the potential difference between its plates is 10.0 V. A 5.0-µF capacitor is similarly charged so that the potential difference between its plates is 5.0 V.

Convert 540 degrees to revolution and radians

8. What is the weight in newtons of a 10 kg mass on the earth's surface?

What do we now understand to be the primary difference between normal galaxies and active galaxies?

Consider what happens at the moment when the block leaves the surface of the globe. Which of the following statements are correct? - The net acceleration of the block is directed straight down.