At apogee, the Moon is at its farthest from Earth and thus appears smaller than normal. Because of this it can produce only annular solar eclipses, but not total solar eclipses
Indicate whether the statement is true or false
TRUE
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__________is a measure of the agitation among the atoms and molecules of a material
A) Temperature B) Accretion C) Eccentricity D) Granulation
The Sun rotates now with a rotation speed of about 2 km/sec. If its radius shrank to the size of Earth, about how fast would it spin?
A. 20 km/sec. B. 400 km/sec. C. 2,000 km/sec. D. 0.2 km/sec. E. 200 km/sec.
Six months of daylight at the North Pole begins when the Sun is at the
a. winter solstice. b. summer solstice. c. autumnal equinox. d. vernal equinox.
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?