What is the approximate latitude of the observer in the diagram below?
a.
20° N
b.
20° S
c.
70° N
d.
70° S
e.
0°
B
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If global warming proceeds during the next century as anticipated, the polar ice caps may melt, substantially raising sea levels around the world (and flooding coastal cities such as New York and New Orleans). What effect will this have on the duration of the day?
A. It will lengthen the day slightly. B. It will shorten it slightly. C. It will have strictly no effect.
The exclusion principle
A. excludes electrons from atomic nuclei. B. means that no two electrons in an atom can have the same orbit. C. implies that in an atom no two electrons can have identical sets of quantum numbers. D. excludes protons from electron orbits.
An ordinary light bulb consumes 60 W of power. Through what height could a 1000-N object be lifted expending the same amount of power for 6 hours?
A) 1300 m B) 360 m C) 720 m D) 650 m E) 430 m
A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat of combustion of coal is 3.3 × 107 J/kg
The steam that drives the turbines is at a temperature of 300°C, and the exhaust water is at 37°C. (a) What is the overall efficiency of the plant for generating electric power? (b) What is the Carnot efficiency? (c) How much thermal energy is exhausted each day?