Earth never passed through the cratering stage in planetary development
a. True
b. False
Indicate whether the statement is true or false
False
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Bulbs A, B, C, and D are identical and connected to a battery as shown. The bulb with the least current passing through it is
A. bulb C. B. bulb A. C. both bulbs A and B. D. both bulbs C and D.
Angular Momentum: In a certain cyclotron, a proton of mass 1.67 × 10-27 kg moves in a circle of diameter 1.6 m with an angular speed of 2.0 × 106 rad/s. What is the angular momentum of the proton?
A. 1.3 × 10-21 kg ? m2/s B. 1.8 × 10-21 kg ? m2/s C. 2.1 × 10-21 kg ? m2/s D. 3.2 × 10-21 kg ? m2/s
A variable resistor is connected to a constant voltage source. When the resistance is increased from 5.5 
to 9.3
what happens to the power dissipated?
A. no change B. a 35% decrease C. a 41% decrease D. a 59% decrease E. a 69% decrease
How much longer does the Sun have to live?
A: About a month- no need to study for finals! B: About 2 years- are you going to graduate in time? C: About a million years- not too much to worry about. D: About 5.5 billion years- what is humanity going to be like? E: The Sun won't die- how silly is that?