1. What is the difference between mass and weight? On earth, what is the weight of a 1 kg mass?

2. When your textbook says that the moon "falls around the earth," does it mean that the moon will eventually fall from the sky and hit the earth? If not, what does it mean?

3. On a winter day, is it scientifically correct to say that the inside of your house is chilly because "cold seeps through the windows from outside"? Why or why not? What might you say instead?

4. Can sound travel through a vacuum? Why or why not?

5. A. A circuit has a resistance of 4 ohms and a potential difference of 8 volts across it. What is the current in the circuit? (Presume the circuit obeys Ohm's law.) Show your calculations.

6. B. How much power does the circuit in part A draw? Show your calculations.