How much work does it take to compress 30 mol of an

How much work does it take to compress 30 mol of an ideal gas at a fixed temperature of 15
degree Celsius to half its volume?
A) 100 J B) 1000 J C) 5 kJ D) 10 kJ E) 50 kJ
Assume an ideal mono-atomic gas. Pick a point in the P-V diagram. Consider the adiabat and
the isotherm that go through this point. What is the ratio of slopes (adiabat/isotherm) in this
point?
An ice cube is floating in a glass of water. Will the water level rise, fall, or remain the same
when the ice cube melts?

Why does it require effort to keep order in your dorm room?
"The entropy of the universe can only increase." Is this an absolute statement or simply an
excellent approximation?
A) It is the truth and nothing but the truth.
B) It is absolutely true because of the large number of microscopic particles that make up
macroscopic particles.
C) It is only an approximation. However, a very good one because of the vast number of
microscopic particles that make up macroscopic particles.
One kilogram of ice at zero degree Celsius is melted and converted to water at zero degree
Celsius. Compute its change in entropy, assuming the melting is done reversibly. The heat of
fusion of water is Lf=334 kJ/kg.
An engine with a mechanical power output of 8.5kW extracts heat from a source at 420K and
rejects it to a 2000kg block of ice at it's melting point. How long can the engine operate at its
efficiency? (Lf=334kJ/kg)
A fully loaded Volvo station wagon has a mass of 1950kg. If each of it's 4 tires is inflated to a
gauge pressure of 230kPa, what is the total tire area in cintact with the road?