What causes more friction, wax paper, aluminum foil, or plastic wrap

When a gun is fired at the shooting range, the gun recoils (moves backward). Explain this using the law of conservation of momentum

What property of a solid would be most important if you were calculating how much paint was required to cover it?

What energy does a ski racer have as she crosses the finish line?

Explain the plate tectonic theory.

3 - (a) What is the period of rotation of Earth in seconds? (b) What is the angular velocity of Earth? (c) Given that Earth has a radius of 40,075 km at its equator, what is the linear velocity at Earth's surface?

The two main parts of a wave are the a. swell and whitecap. c. crest and trough. b. wavelength and wave height. d. rise and dip.

A block of mass m=16.8 kg is sliding on a surface with initial velocity v=23.2 m/s. The block has a coefficient of kinetic friction μk = 0.426 with respect to the surface and is being pushed by a force of magnitude F=86.

Two children are pulling and pushing a 30.0 kg sled. The child pulling the sled is exerting a force of 12.0 N at a 45o angle. The child pushing the sled is exerting a horizontal a force of 8.00 N. There is a force of friction of 5.00 N.

Describe what a planetesimal is. Is it related to a protoplanet?

Describe the medium that electromagnetic waves use to travel