A light bulb operating at a voltage of 120 V has a resistance of 200 ?. What is the power?
A)
100 W
B)
60 W
C)
72 W
D)
14 x 10-3 W
E)
7.2 W
C
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Three identical resistors are connected in series to a 12-V battery. What is the voltage across any one of the resistors?
A) 36 V B) 24 V C) 12 V D) 4 V E) zero
The theory of dark energy tells us that
A) empty space is seething with a form of energy. B) there is a force that behaves like an anti-gravity. C) there is still much to learn about this universe. D) All of the above.
The operation of a microwave oven makes use of
A) the polar nature of water molecules. B) flip flopping of polarized molecules. C) an oscillating electric field. D) all of the above E) none of the above
A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground
a. 44 m b. 14 m c. 74 m d. 30 m e. 60 m