Does a spring scale measure weight or mass? why?

According to newtons universal law of gravitation, which would change the parh of the ball so it traces out widest curved path possible?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.