Suppose you have a spool of thread that can rotate around a fixed axis as you pull thread off it. If you pull the thread with your hand so that the thread always lies along a certain fixed line, how will your hand’s speed as it moves compare to 
, where R is the spool’s radius and 
is angular speed?
A. The hand’s speed will be greater than 
.
B. The hand’s speed will be less than .
C. The hand’s speed will be equal to .
D. The hand’s speed has nothing to do with .
C. The hand’s speed will be equal to .
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Which of these colors of light has photons of greatest energy?
a. Red b. Orange c. Green d. Yellow
An ac circuit has a 100-? resistor in series with a 4.9-?F capacitor and a 700-mH inductor. At what frequency does the circuit act like a pure resistance?
A) 0.29 MHz B) 1.9 MHz C) 12 MHz D) 0.54 kHz E) 86 Hz
Neptune has a radius of 2.48 × 107 m and an escape velocity of 23,300 m/s. What is the mass of Neptune? G = 6.67 x 10-11 N•m2/kg2
A) 1.01 × 1026 kg B) 2.02 × 1026 kg C) 3.03 × 1026 kg D) 4.04 × 1026 kg E) 5.05 × 1026 kg
What does the universe look like on very large scales?
A) Galaxies are uniformly distributed. B) Galaxies are randomly distributed. C) Galaxies are distributed in a hierarchy of clusters, superclusters, and hyperclusters. D) Galaxies appear to be distributed in chains and sheets that surround great voids. E) Galaxies are distributed in a great shell expanding outward from the center of the universe.