The circuit below contains three 100-W light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) brightest?
A. A
B. B
C. C
D. B and C
E. All three are equally bright.
Answer: A
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Terminal Voltage and Internal Resistance: A 7.0-? resistor is connected across the terminals of a battery having an internal emf of 10 V. If 0.50-A current flows, what is the internal resistance of the battery?
A. 13 ? B. 20 ? C. 10.8 ? D. 27.0 ?
A 2.00 kg pendulum bob on a string 2.00 m long, is released with a velocity of 1.50 m/s when the support string makes an angle of 30.0 degrees with the vertical. What is the tangential acceleration of the bob at the highest point of its motion?
A. 5.33 
B. 5.77
C. 6.25
D. 7.00
E. 7.25
The internal energy of an ideal gas is changed by adding heat Q to the system and also by doing work W on the gas. What is the change in internal energy of the gas?
A) 4.186Q - W B) Q - 4.186W C) W - Q D) Q + W E) Q - W
What occurs in a pan of water placed outdoors on a warm day?
A) evaporation B) condensation C) both of these D) neither of these