Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. What is their separation after the heavier astronaut has moved 12 m?
A) 9.0 m
B) 16 m
C) 21 m
D) 24 m
E) 28 m
E
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Internal forces cannot change the total momentum of a system
Indicate whether the statement is true or false
Consider the two inductors shown below (which are in independent circuits). The induced emf in each inductor is such that the inductor behaves like a battery with its positive end to the right. 
Which inductor carries the larger current?
A. Inductor 1 B. Inductor 2 C. The current or change in current is the same in both. D. One needs more information to answer the question.
The diagram represents energy levels in a hydrogen atom. The labeled transitions (A through E) represent an electron moving between energy levels
Suppose that an electron in a hydrogen atom absorbs 10.2 eV of energy, so that it moves from level 1 to level 2. What typically happens next? A) The electron remains in level 2 until it absorbs an additional 10.2 eV of energy. B) The electron jumps to level 3 as soon as it absorbs any additional energy. C) A different electron drops into level 1, since it is now unoccupied. D) The electron returns to level 1 by emitting an ultraviolet photon with 10.2 eV of energy.
Your radio is tuned to 98 on the FM dial. What electromagnetic wave frequency is your radio receiving, and how fast is this wave traveling?
A) 98 × 106 Hz, at the speed of sound B) 98,000 Hz, at the speed of sound C) 98 Hz, at a speed of 300,000 km/s D) 98,000 Hz, at a speed of 300,000 km/s E) 98 × 106 Hz, at a speed of 300,000 km/s