A brass rod with a length of 20.0 cm is placed side by side with an aluminum rod with a length of 20.0 cm and this system is placed between a hot temperature of 150
and a cold temperature of -10.0
The coefficient of thermal conductivities of the brass and the aluminum are 100 W/m 
and 230 W/m C respectively. The rods have the same cross sectional area of 20.0 cm2. What is the heat flow from the hot temperature to the cold temperature?
A. 683 W
B. 528 W
C. 52.8 W
D. 68.3 W
B. 528 W
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Impulse: A steady horizontal force lasting for 2.1 s gives a 1.25 kg object an acceleration of 3.2 m/s2 on a frictionless table. What impulse does this force give to the object?
A. 26 kg ? m/s B. 11 kg ? m/s C. 8.4 kg ? m/s D. 2.6 kg ? m/s
An apple pie will be a net emitter of energy when its temperature is
A) higher than its surroundings. B) lower than its surroundings. C) none of these
What do astronomers mean when they say that we are all "star stuff"?
A) Life would be impossible without energy from the Sun. B) Earth formed at the same time as the Sun. C) Many of the elements from which we and Earth were made were created by stars. D) The Sun formed from the interstellar medium: the "stuff" between the stars. E) The universe contains billions of stars.
Over time, the star-gas-star cycle leads the gas in the Milky Way to
A) have a greater abundance of heavy elements. B) have a lower abundance of heavy elements. C) become denser and have a greater abundance of heavy elements. D) become denser and hotter.