Which of the four fundamental forces is mainly responsible for contact forces? A. gravity B. weak nuclear force C. electromagnetic force D. strong nuclear force

A student weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. what is the average power expended by the student to overcome gravity?

An astronaut is floating in space when the support line is cut. If the 68kg astronaut needs to reach the spaceship (20m away), how long will it take if he throws a 12kg canister at 12m/s?

What type of wave and energy creates sound?

A small smooth object slides from rest down a smooth inclined plane inclined at 30 degrees to the horizontal. What is (i) the acceleration

The Earth includes: a. A Pepsi inner core, a Coke outer core, and a mantle of Gatorade drinkers. b. A solid inner core, a liquid outer core, and a mantle with a liquid asthenosphere. c.

Electrical energy is the most useful form of energy. Is this statement a fact or an opinion? Explain.

Describe how private citizens have a voice in which projects the federal government will fund

What two factors cause change in seasons

Describe and explain the motion of a small ball floating on a pond when waves travel across the pond

Describe how the doppler effect explains why an approaching fire engine's siren has a high pitch?