Which of the following is not considered crucial for life to exist on some world?
A) liquid water
B) a source of energy that can be used by life
C) a source of nutrients
D) an atmosphere
D
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A high f-number:
a. allows using a slower shutter speed. b. causes more spherical aberration. c. allows a larger depth of focus. d. is not related to any of the above options.
A series LR circuit includes a 9.0 V battery, a resistance of 0.20 
and an inductor. When the switch is closed, the circuit exhibits a time constant of 200 ms. What is the inductance of the circuit?
A. 42 mH B. 15 mH C. 32 mH D. 40 mH E. 22 mH
The figure shows a cross section of three parallel wires each carrying a current of 20 A. The currents in wires A and B are out of the paper, while that in wire C is into the paper. If the distance R = 5.0 mm, what is the magnitude of the force on a 2.0-m length of wire A?
A. 23 mN B. 64 mN C. 32 mN D. 46 mN E. 55 mN
The fact that one side of the Moon always faces Earth is evidence that while revolving about the Earth it
A) does not rotate about its axis. B) rotates about its axis.