A coal-fired plant generates 600 MW of electric power. The plant uses 4.8 × 106 kg of coal each day, and 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) How much thermal energy is exhausted each day? (c) Using the same heat reservoirs, what is the maximum possible efficiency for a thermodynamic engine?
(a) 33% (b) 1.1 × 1014 J (c) 46%
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A battery in a large flashlight produces a current of 2 amperes in a light bulb that has a resistance of 3 ohms. What is the voltage of the battery?
Two objects attract each other gravitationally. If the distance between their centers doubles, the gravitational force
A. is a half. B. doubles. C. is a fourth. D. quadruples.
The Earth rotates 360 degrees on its axis
twice a day such that the Sub rises in the West and sets in the East. once a day such that the Sun rises in the East and sets in the West. twice a day such that the Sun rises in the East and sets in the West. once a day such that the Sun rises in the West and sets in the East.
According to our theory of solar system formation, which law best explains why the solar nebula spun faster as it shrank in size?
A) the law of conservation of angular momentum B) the law of conservation of energy C) the law of universal gravitation D) Einstein's law E = mc2