A 400-W computer (including the monitor) is turned on for 8.0 hours per day. If electricity costs 10¢ per kWh, how much does it cost to run the computer annually for a typical 365-day year?
A) $1200 B) $15 C) $120 D) $17 E) $150
C
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If protons are accelerated from rest in a Van de Graff accelerator through a potential difference of 1.00 MV, what is their resulting speed?
a. 
b. 
c. 
d. 
e. 
A material has an index of refraction that increases continuously from top to bottom. Of the three paths shown in the figure, which path will a light ray follow as it passes through the material?
Define specific heat at constant pressure.
What will be an ideal response?
According to our theory of solar system formation, why do all the planets orbit the Sun in the same direction and in nearly the same plane?
A) The laws of conservation of energy and conservation of angular momentum ensure that any rotating, collapsing cloud will end up as a spinning disk. B) The original solar nebula happened to be disk-shaped by chance. C) Any planets that once orbited in the opposite direction or a different plane were ejected from the solar system. D) Luck explains it, as we would expect that most other solar systems would not have all their planets orbiting in such a pattern. E) The Sun formed first, and as it grew in size it spread into a disk, rather like the way a ball of dough can be flattened into a pizza by spinning it.