1.) A neutron in a reactor makes an elastic head-on collision with the nucleus of an atom
initially at rest.
Assume: The mass of the atomic nucleus is
about 14.4 the mass of the neutron.
What fraction of the neutron's kinetic en-
ergy is transferred to the atomic nucleus?

2.) If the initial kinetic energy of the neutron is 6.83x10^-13J, find its final kinetic energy.
Answer in units of J

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).