Explain why the temperature of a gas increases when it is adiabatically compressed.

Can mechanical energy ever be transformed completely into heat or internal energy? Can the reverse happen? In each case, if your answer is no, explain why not; if yes, give one or two examples.

An "emergency blanket" is a thin shiny (metal coated) plastic foil. Explain how it can help to keep an immobile person warm.

A premature baby in an incubator can be dangerously cooled even when the air temperature in the incubator is warm. Explain.

Explain why air temperature readings are always taken with the thermometer in the shade.

The floor of a house on a foundation under which the air can flow is often cooler than a floor that rests directly on the ground (such as a concrete slab foundation). Explain.

The floor of a house on a foundation under which the air can flow is often cooler than a floor that rests directly on the ground (such as a concrete slab foundation). Explain.

Microprocessor chips have a "heat sink" glued on top that looks like a series of fins. Why is it shaped like that?

Explorers on failed Arctic expeditions have survived by covering themselves with snow. Why would they do that?

Energy may be stored for use during peak demand by pumping water to a high reservoir when demand is low and then releasing it to drive turbines when needed. Suppose water is pumped to a lake 135 m above the turbines at a rate of $1.00 \times 10^{5} \mathrm{kg} / \mathrm{s}$ for 10.0 h at night. If all this energy is released during a 14-h day, at 75% efficiency, what is the average power output?

Energy may be stored for use during peak demand by pumping water to a high reservoir when demand is low and then releasing it to drive turbines when needed. Suppose water is pumped to a lake 135 m above the turbines at a rate of $1.00 \times 10^{5} \mathrm{kg} / \mathrm{s}$ for 10.0 h at night. How much energy (kWh) is needed to do this each night?

Solar cells can produce about 40 W of electricity per square meter of surface area if directly facing the Sun. How large an area is required to supply the needs of a house that requires 22 kWh/day? Would this fit on the roof of an average house? (Assume the Sun shines about 9 h/day.)

Suppose that you repeatedly shake six coins in your hand and drop them on the floor. Construct a table showing the number of microstates that correspond to each macrostate. What is the probability of obtaining six heads?

Suppose that you repeatedly shake six coins in your hand and drop them on the floor. Construct a table showing the number of microstates that correspond to each macrostate. What is the probability of obtaining three heads and three tails.