Changing the orbit of a spacecraft by firing thrusters is an example of
A) Newton's first law of motion.
B) Newton's second law of motion.
C) Newton's third law of motion.
D) the universal law of gravitation.
E) none of the above.
C
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Which of the following is the origin of most of the large moons around the jovian planets?
A) They are captured asteroids. B) They are captured comets. C) They are captured planets. D) They were formed by condensation and accretion in a disk of gas around the planet. E) They were formed by giant impacts.
During each cycle of operation, a refrigerator absorbs 230 J of heat from the freezer and expels 356 J of heat to the room. How much work input is required in each cycle?
A) 712 J B) 586 J C) 460 J D) 310 J E) 126 J
When a switch is closed to complete a DC series RL circuit,
a. the electric field in the wires increases to a maximum value. b. the magnetic field outside the wires increases to a maximum value. c. the rate of change of the electric and magnetic fields is greatest at the instant when the switch is closed. d. all of the above are true. e. only (a) and (c) above are true.
Watch dials contain radium glow because
A. all radioactivity creates light B. batteries supply energy when a button is pushed C. the radiation hits a phosphor D. They don't glow. Only tritium glows.