1. a student studying a circuit diagram of a lightbulb, battery, and a switch correctly identifies it as a closer circuit. in this diagram, the lightbulb would be
a. an insulator
b. on
c. disconnected
d. off

2. the force of gravity on an object on the surface of mars is less than the force of gravity on an identical object on the surface of earth. which of the following is a example why this is true?
a. mars has more volume than earth
b. earth has more volume then mars
c. mars has less mass than earth
d. earth has less mass then mars