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Questions in physics

[Terjawab] What can you put on metal letters to protect them from acid rain?

[Terjawab] On the seashore, pebbles that are rough and uneven become smooth and rounded. Explain how they become smooth and rounded.

[Terjawab] Blaine skis down a hill at an angle of 12°. He has a mass of 82 kg. What is the normal force on Blaine?

[Terjawab] Identify three different kinds of physical change that could happen to a plastic spoon.

[Terjawab] Does partial reflection and refraction occur when light travels from a slow to fast medium? Explain.

[Terjawab] What is the net force if you push a cart to the right with 5 N of force and a friend pushes the cart to the left with 5 N?

[Terjawab] If the Earth exerts a force of 2100 N on an orbiting communication satellite that is 38 miles above the Earth, what is the magnitude of the force the satellite will exert on the Earth?

[Terjawab] A 2,000-kilogram railroad car moving at 5 m/sec to the east collides with a 6,000-kilogram railroad car moving at 3 m/sec to the west. If the cars couple together, what is their velocity after the collision?

[Terjawab] You hit the wall with a stick. What is the equal but opposite reaction?

[Terjawab] Apply the law of conservation of energy and describe the energy transformations that occur as you coast down a long hill on a bicycle and then apply the brakes to make the bike stop at the bottom. A roller coaster is at the top of a hill and rolls to the top of a lower hill. If mechanical energy is constant, then on the top of which hill is the kinetic energy from the roller coaster's motion greater?