A student is sleeping under a small goose-down comforter that has coefficient of thermal conductivity of 0.025 W/m 
The thickness of the down comforter is 5.0 cm and the area of the comforter is 2.0 m2. If the temperature difference between inside of the comforter and the outside of the comforter 40
then what is the rate of heat flow through the comforter?
A. 10 W
B. 20 W
C. 30 W
D. 40 W
E. 50 W
D. 40 W
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The distribution of the mass of the Milky Way Galaxy is determined by
A) counting the number of stars. B) determining the amount of gas and dust. C) studying how stars are distributed in the Milky Way. D) studying the rotation of the galaxy. E) weighing various parts of the Milky Way.
Io's internal heat is due to tidal interactions with Jupiter and Europa
Indicate whether the statement is true or false
An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
A depression on the land surface caused by the collapse of a cavern is called a(n)______________
Fill in the blank(s) with correct word