Asteel block has a volume of 0.08 m³ and a density of 7,840 kg/m³. what is the force of gravity acting
on the block (the weight) in water?

Apossible explanation for a set of facts that can be tested by further investigation is called

Arailroad car collides with and sticks to an identical railroad car that is initially at rest. after the collision, the total kinetic energy of the two cars is a) the same as before. b) half as much as before. c) one third as much as before. d) one fourth as much as before. e) twice as much as before.

50 points to who answers this question in a clear and simple explanation : to what hight will a mass of weight of 500 n be raised in 20 seconds by a motor using 4kw of power?