Which is the oldest geological feature of Mercury?
a. smooth plains
b. jumbled terrain
c. intercrater plains
d. lobate scarps
e. rilles
c
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A series LR circuit includes a 9.00 V battery, a 30.0 mH inductor, and a resistance of 5.00 
What is the time constant of this circuit?
A. 115 s
B. 170 s
C. 4.20 ms
D. 6.00 ms
E. 8.30 ms
Pascal's Principle: A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil and capped at both ends with tight-fitting pistons. The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the initial force that must be applied to the smaller piston in order to start lifting the car? For purposes of this problem, neglect the weight of the pistons.
A. 727 N B. 926 N C. 2.90 kN D. 3.33 kN E. 1.20 kN
Which of these is NOT a form of electromagnetic radiation?
A) ultraviolet causing a suntan B) DC current from your car battery C) X-rays in the doctor's office D) light from your camp fire E) radio signals
Energy Conservation With Nonconservative Forces: A heavy sled and a light sled, both moving horizontally with the same kinetic energy, suddenly slide onto a rough patch of snow and eventually come to a stop. The coefficient of kinetic friction between the sleds and the rough snow is the same for both of them. Which of the following statements about these sleds are correct? (There could be more than one correct choice.)
A. Both sleds will slide the same distance on the rough snow before stopping. B. The heavy sled will slide farther on the rough snow than the light sled. C. The light sled will slide farther on the rough snow than the heavy sled. D. On the rough snow, the change in kinetic energy will be the same for both sleds. E. The friction from the snow will do the same amount of work on both sleds.