A heavy ball hangs by a string, with a second string attached to its bottom (Figure 1.7 in your text). A slow pull on the bottom string breaks the
A) top string.
B) bottom string.
C) top or bottom string equally likely.
D) none of the above
Answer: A
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A system is acted on by its surroundings in such a way that it receives 80 J of heat while simultaneously doing 20 J of work. What is its net change in internal energy?
a. 100 J b. 60 J c. zero d. ?60 J e. ?100 J
At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A) zero. B) upward. C) toward the north. D) toward the south. E) downward.
What is the largest repository of fresh water?
What will be an ideal response?
Why can't we see past the cosmological horizon?
A) Beyond the cosmological horizon, we would be looking back to a time before the universe was born. B) We do not have big enough telescopes. C) The cosmological horizon is infinitely far away, and we can't see to infinity. D) Every galaxy in the entire universe (not just the observable universe) exists within the cosmological horizon, so there's nothing to see beyond it.