The weight of an astronaut plus his space suit on the Moon is only 260 N. how much is the weight on earth assuming the gravity on the moon is 1.67?

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body