Which three statements describe mechanical waves? A.
The waves need matter to transfer energy.
B.
The waves transfer energy by causing particles of matter to move.
C.
The waves can travel through empty space.
D.
The waves can transfer energy through solids, liquids, and gases.

An object is dropped from a tower, 400 ft above the ground. the object's height above ground t seconds after the fall is s(t)equals400 minus 16 t squared. determine the velocity and acceleration of the object the moment it reaches the ground. the velocity of the object the moment it reaches the ground is nothing ft/s.

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

An automobile steering wheel is shown. what is the ideal mechanical advantage? if the ama is 8, what is the efficiency of the steering wheel?