A heat engine would have 100% efficiency if its low-temperature reservoir were
A) as hot as its reservoir.
B) at absolute zero.
C) either of these
D) neither of these
Answer: B
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Star X has an apparent magnitude of 3, and star Y has an apparent magnitude of 8. How do they compare in observed brightness?
A) Star X is 100 times brighter than star Y. B) Star X is 5 times brighter than star Y. C) Star Y is 100 times brighter than star X. D) Star Y is 5 times brighter than star X.
A potential energy function is given by U(x) = ( 3.00 N/m)x - ( 1.00 N/m3)x3. At what position or positions is the force equal to zero?
A) m and - m B) 0.00 m, m and - m C) 1.00 m and -1.00 m D) 3.00 m and -3.00 m E) The force is not zero at any location.
According to Newton's third law, the Voyager probes pulled just as hard on Jupiter as it did on them when they flew past it. Why were they accelerated enough to leave the solar system but Jupiter still is in orbit about the Sun?
What will be an ideal response?
Which igneous rock has light color (high silica content) and large grains (coarse texture)?
a. Gabbro b. Granite c. Rhyolite d. Basalt