If the Moon is suddenly and inexplicably moved to four times its current distance from Earth, its orbital speed ________.
A. increases by a factor of 2
B. decreases by a factor of 4
C. increases by a factor of 4
D. decreases by a factor of 2
E. is unchanged due to its low mass
Answer: D
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A polarizer (with its preferred direction rotated 30° to the vertical) is placed in a beam of unpolarized light of intensity 1. After passing through the polarizer, the beam's intensity is
A) 0.25. B) 0.50. C) 0.63. D) 0.87. E) 0.75.
Consider an LRC circuit that is driven by an AC applied voltage. At resonance,
A) the peak voltage across the resistor is equal to the peak voltage across the inductor. B) the peak voltage across the resistor is equal to the peak voltage across the capacitor. C) the peak voltage across the capacitor is greater than the peak voltage across the inductor. D) the current is in phase with the driving voltage. E) the peak voltage across the inductor is greater than the peak voltage across the capacitor.
The nichrome heating element in an electric drier operates on 240 V and generates thermal energy at the rate of 2.0 kW. The heating element shorts out and, in repairing it, the repairman shortens the nichrome wire by 10%
(Assume the temperature is unchanged. In reality, the resistivity of the wire will depend on its temperature.) What effect will the repair have on the power dissipated in the heating element? A) The power is still 2.0 kW. B) The power increases to 2.2 kW. C) The power decreases to 1.8 kW. D) None of the given answers is correct.
A CD has a diameter of 12.0 cm. If the CD starts from rest and has a constant angular acceleration of 2.00 
then the centripetal acceleration of a point 3.00 cm from the center of the CD after 3.00 sec is
A. 0.950 
B. 1.08
C. 1.25
D. 1.58
E. 1.83