An exerciser lifts 10.00 N weights a vertical distance of 50.00 cm. How many times would the exerciser have to lift the weight to use 10.00 Calories of energy?
A. 7,503
B. 4,125
C. 5,170
D. 8,370
E. 9,670
D. 8,370
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A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day. The heat produced by the 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 maximum efficiency that this plant could possibly have using the same temperature extremes that it presently uses? (c) How much thermal energy is exhausted each day by this plant?
The overall dimming of starlight by interstellar matter is called:
A) extinction. B) reddening. C) absorption. D) emission. E) scattering.
A quantity that measures the opposition to the flow of charge is
a. voltage b. current c. resistance d. electric field e. critical temperature
Pure water is classified as
A. an insulator. B. a conductor. C. a semiconductor. D. all of these choices are correct E. none of these choices are correct