Which of the following celestial bodies has the greatest influence on Earth's tides?
A. Moon
B. Sun
C. Venus
D. Jupiter
Ans: A. Moon
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Based on the idea of "spaceship Earth," write one or two paragraphs explaining why it is not the case that we are "just sitting here."
What will be an ideal response?
If a white dwarf gains sufficient mass, it can become a:
A) brown dwarf. B) type II supernova. C) type I supernova. D) planetary nebula. E) black dwarf.
The acceleration of a ball as it rolls down a ramp is 4 m/s2 . The ball is referred to 2 s after it starts to roll. A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is
a. 0 d. 5 m/s2 b. 2 m/s2 e. 7.5 m/s2 c. 4 m/s2
A conducting rod is sliding on metal rails with velocity v. A magnetic field B is into the paper, the separation of the rails is L, and the resistance of the circuit is R. In what direction in the diagram is the current flowing in the resistor?
A. up
B. down
C. up then down
D. down then up
E. Insufficient information given,