One light-year is the distance light travels in one year. The speed of light is about 300,000 km/s (3 × 105 km/s). How far is 1 light-year?
A) 3 × 105 km
B) 1.8 × 107 km
C) 1.08 × 109 km
D) 9.46 × 1012 km
D) 9.46 × 1012 km
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A water hose has a flow rate of 3.0 kg/s of water. If the velocity of the water as it leaves the hose is 5.0 m/s, then the force to hold the hose is
A. 15 N. B. 26 N. C. 30 N. D. 45 N. E. 57 N.
In the hypothetical atomic interaction shown in figure C9.13, assume that initially the atoms have a total energy of 3 × 10-21 J at r = 0.1 nm. These atoms are
A. Unbound (they will separate to infinity).
B. Bound (they will not separate to infinity).
C. The answer depends on whether the atoms are initially moving toward or away from each other.
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 5.0-kg mass is suspended by a string from the ceiling of an elevator that is moving upward with a speed which is decreasing at a constant rate of 2.0 m/s in each second. What is the tension in the string supporting the mass?
a. 49 N b. 39 N c. 59 N d. 10 N e. 42 N