Multiple Choice

1. b.
2. c.
3. b.
4. b.
5. b.
6. b.
7. b.
8. d.
9. d.
10. e.
11. b.
12. b.
13. a.

Problems

1. Break this up into four parts. 1. Water, 2. Block, 3. Kinetic Energy, 4. Potential Energy.
And, nanoscale means to describe the smallest particles, their motions and positions. So.....

The water gains heat (energy) from the hot block. The water first uses this heat to
increase in temperature ONLY, the water molecules gain kinetic energy and jiggle faster and
faster until the water reaches the boiling point at 100 degrees celsius. Then, the water molecules
that undergo a phase change at the boiling point will spread further apart which is a change in
potential energy ONLY. During the phase change the water molecules DO NOT CHANGE
TEMPERATURE, DO NOT CHANGE KE, DO NOT CHANGE HOW FAST THEY ARE MOVING,
they only spread further apart and convert to water vapor. The block of hot metal cools
down in temperature as it transfers heat to the water, thus the molecules that make up the metal
block are losing kinetic energy of motion and jiggle around slower and slower as it cools.

2. a.  1665 J, b.  13.6 degrees C

3. a.  1.5 m/s west, b.  6 m west

4. a.  0 kg m/s, b.  120 kg m/s to the right, c.  1.33 m/s

5. b.  4.9 J, c.  6.26 m/s, d.  4.43 m/s