Which of the following statements about ice melting is true?
a) energy flows from the ice to its surroundings.
b) water molecules move from their fixed positions.
c) water molecules lose energy.

I believe the answer to be B. Water molecules move from their fixed positions.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.