A heat pump is used to heat a house in Minnesota in the winter and has half the ideal coefficient of performance for a reversible heat pump. If the outside air temperature is 
and the indoor temperature desired is 
and if it can do work at a rate of 1250 W, what is the rate of heat flow into the house?
A. 340 W
B. 1100 W
C. 625 W
D. 300 W
D. 300 W
Physics & Space Science
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Parallax measurements of the distances to the nearest stars use ________ as a baseline.
A. Earth's orbit B. Earth-Moon distance C. Earth's diameter D. about the length of a football field
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What is one of the alternatives to the hypothesized existence of dark matter?
A) The astronomers are misrepresenting the observations. B) The current theory of gravity is being used incorrectly. C) The observations are incorrect. D) The theory of gravity is wrong.
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A constant net force on a railroad car produces constant
A) velocity. B) acceleration. C) both of these D) neither of these
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Greenhouse gasses include
a. water vapor. b. CO2. c. CO. d. methane.
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