If the net work done on an object is zero, what can you determine about the object's kinetic energy?
the object's kinetic energy is decreasing.
the object's kinetic energy remains the same.
the object's kinetic energy is zero.
the object's kinetic energy is increasing.

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

The atoms in a nickel crystal vibrate as harmonic oscillators with an angular frequency of 2.3 × 1013 rad/s. the mass of a nickel atom is 9.75 × 10-26 kg. what is the difference in energy between adjacent vibrational energy levels of nickel? (h = 6.626 × 10-34 j • s, , 1 ev = 1.60 × 10-19 j)

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.