The primary function of any heat engine is to
A. destroy energy and replace it with work.
B. convert heat into work.
C. create a large amount of energy from a small amount of heat.
D. create heat.
Answer: B
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Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In that case
A) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2. B) we can't say anything about these galaxies except for their distances. C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2.
The least common type of star is a(n) ____
a. white dwarf b. lower main sequence c. upper main sequence d. giant e. supergiant
Emission nebulae like M42 occur only near stars that emit large amounts of
A) infrared heat. B) X-rays and gamma rays. C) microwaves. D) ultraviolet radiation. E) visible light.
A 50.0-kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.300 and the coefficient of kinetic friction is 0.200
What is the friction force on the box if (a) a horizontal 140-N push is applied to it? (b) a horizontal 175-N push is applied to it?