Light shining through a bottle of water is often bent. This change in direction is called:
a. Reflection
b. Refraction
c. Interference
d. Diffusion
Ans: b. Refraction
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If the nation's yearly total energy use and also the yearly gross national product [GNP] are graphed, the two graphs rise at the same rate until the mid-1970s, but they diverge from each other after about 1973
This divergence of the graphs shows that A) energy use increases when the nation's goods and services increase. B) U.S. energy efficiency decreased after 1973, due to lower energy prices. C) energy efficiency has played a large role in providing goods and services since 1973. D) as the price of goods and services decreases, energy use increases. E) an increasing GNP causes energy use to also increase.
A heater is rated at 1200 watts for a 120-volt source.If two heaters are connected in parallel across the 120-volt source, the current drawn from the source is 10 amperes
a. True b. False Indicate whether the statement is true or false
The Milky Way galaxy is about
A) 4 light years in diameter. B) 40 light years in diameter. C) 100 light years in diameter. D) 100,000 light years in diameter.
Parallel-Plate Capacitor: A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces. The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C)(a) How much excess charge must be on each plate to hold the oil drop steady?(b) Which plate must be positive, the upper one or the lower one?
What will be an ideal response?