The mass of 1 m3 of fresh water is 1,000 kg. At the top of a hydroelectric dam the potential energy of the water is
a. 1,000 N. b. 9,800 N.
c. 500 N. d. There is not enough information to calculate the potential energy.
d
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In what year did the United States officially adopt the metric system?
a. 1893 b. 1995 c. 2011 d. 1776 e. none of these
A continuous spectrum is created by a hot ionized gas
a. True b. False Indicate whether the statement is true or false
A helicopter is flying horizontally with a speed of 444 m/s over a hill that slopes upward with a 2% grade (that is, the "rise" is 2% of the "run"). What is the component of the helicopter's velocity perpendicular to the sloping surfac
A) 8.9 m/s B) 220 m/s C) 435 m/s D) 444 m/s
How much heat must be removed from 456 g of water at 25.0°C to change it into ice at -10.0°C? The specific heat of ice is 2090 J/(kg K) and the latent heat of fusion of water is 33.5 × 104 J/kg
A) 105 kJ B) 153 kJ C) 57.3 kJ D) 47.7 kJ E) 210 kJ