If a 500-W heater carries a current of 4.00 A, what is the resistance of the heating element?
a. 85.7 ?
b. 42.8 ?
c. 31.3 ?
d. 11.2 ?
c
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Transformers: The primary coil of an ideal transformer has 100 turns and its secondary coil has 400 turns. If the ac voltage applied to the primary coil is 120 V, what voltage is present in its secondary coil?
A. 100 V B. 30 V C. 70 V D. 480 V E. 400 V
If a pizza radiates more energy than it absorbs, its temperature
A) decreases. B) is unaffected. C) increases. D) none of the above
Snell's Law: As shown in the figure, a laser positioned on a ship is used to communicate with a small research submarine resting on the bottom of a lake. The laser is positioned 12 m above the surface of the water, and it strikes the water 20 m from the side of the ship. The water is 58 m deep and has an index of refraction of 1.33. How far horizontally is the submarine from the side of the ship? (Assume all numbers are accurate to three significant figures.)
A. 69 m B. 49 m C. 89 m D. 59 m E. 79 m
The mass of an atom of carbon-12 (Z = 6) is less than the mass of 6 protons and 6 neutrons because of __________
Fill in the blank(s) with correct word