The fact that the acceleration of free fall is the same for all masses is explained by Newton's (a) first law. (c) third law. (b) second law. (d) law of action-reaction.

Summarize the main consequences of the third law of thermodynamics. Explain how it casts a shadow of doubt on some of the conclusions from various thermodynamic models.

State the third law of thermodynamics.

In a hydraulic press operation, the output piston cannot (a) move farther than the input piston. (b) exceed the force input. (c) exceed the input piston's speed. (d) produce increased energy.

When a cannonball is fired from a cannon, both the cannonball and the cannon experience equal (a) amounts of force. (b) accelerations. (c) Both. (d) Neither.

What is the difference between the classical and the statistical approaches to thermodynamics?

The average speed of a gazelle traveling a distance of $2 \mathrm{~km}$ in a time of one-half hour is (a) $1 \mathrm{~km} / \mathrm{h}$. (b) $2 \mathrm{~km} / \mathrm{h}$. (c) $4 \mathrm{~km} / \mathrm{h}$. (d) greater than $4 \mathrm{~km} / \mathrm{h}$.

The vibrations in a longitudinal wave move in a direction (a) along and parallel to the wave. (b) perpendicular to the wave. (c) Both of these. (d) Neither of these.

From the Periodic Table, name a three metals a three non-metals that you expect to behave in a similar way.

The power required to raise a $100-\mathrm{kg}$ crate a vertical distance of $2 \mathrm{~m}$ in a time of $4 \mathrm{~s}$ is (a) $200 \mathrm{w}$ (b) $500 \mathrm{~W}$. (c) $800 \mathrm{~W}$. (d) $2000 \mathrm{~W}$.

The team that wins in a tug-of-war is the team that (a) produces more tension in the rope than the opponent. (b) pushes hardest on the ground. (c) Both. (d) Neither.

A skipper on a boat notices wave crests passing his anchor chain every $5 \mathrm{~s}$. He estimates the distance between wave crests to be $15 \mathrm{~m}$. He also correctly estimates the speed of the waves. Show that this speed is $3 \mathrm{~m} / \mathrm{s}$.

When connected in parallel across a $12 \mathrm{~V}$ battery, two resistors carry currents of $0.50 \mathrm{~A}$ and $0.75 \mathrm{~A}$, respectively. What currents will these resistors carry if they are connected in series with the same battery?

Solve the problem by writing a variation model. The voltage (in volts) measured across a resistor is directly proportional to the current (in amperes) flowing through the resistor. The constant of variation is the resistance (in ohms). If 6 volts is measured across a resistor carrying a current of 2 amperes, find the resistance.