If you knew that americium was a fairly recent
discovery, what chemical symbol would you expect
it to have?
a) Co
b) Fz
c) Am
d) Us
c
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Springs: You want to store 1000 J of energy in an ideal spring when it is compressed by only 2.5 cm. What should be the force constant (spring constant) of this spring?
Fill in the blank(s) with the appropriate word(s).
A series circuit consists of a 1.02 V source of emf, a 2.00 mF capacitor, a 1000 
resistor, and a switch. When the switch is closed, how long does it take for the current to reach one-half its maximum value?
A. 0.693 s B. 1.39 s C. 2.00 s D. 1.69 s E. 0.0250 s
The pressure in a gas:
A) depends on the temperature of the gas. B) does not depend on the density of the gas. C) does not depend on the volume of the gas. D) depends on the gravitational force on the gas.
The choices below describe four hypothetical planets. Which one's surface would you expect to be most crowded with impact craters? (Assume the planets orbit a star just like the Sun and that they are all the same age as the planets in our solar
system.) A) Size: same as Venus. Distance from Sun: same as Mars. Rotation rate: once every 25 hours. B) Size: same as Mars. Distance from Sun: same as Earth. Rotation rate: once every 18 hours. C) Size: same as the Moon. Distance from Sun: same as Mars. Rotation rate: once every 10 days. D) Size: twice as big as Earth. Distance from Sun: same as Mercury. Rotation rate: once every 6 months.