The second law of thermodynamics
A. describes the state of a system.
B. applies only when the first law is satisfied.
C. precludes perpetual motion machines.
D. does not apply to an isolated system.
C. precludes perpetual motion machines.
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Olbers's paradox is based on the assumption that the Universe began at some time in the past
Indicate whether the statement is true or false
A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what is her speed at the bottom?
a. 11 m/s b. 17 m/s c. 24 m/s d. 27 m/s
Apart from its distance from its parent star, what is the next most important factor that determines a planet's habitability?
A) whether it has a large moon B) the size of the planet C) the chemical composition of its atmosphere D) the chemical composition of its surface
Which of the following statements best explains why the planets orbit in nearly a single plane and in the same direction around the Sun?
A) The planets all rotate in same direction as they orbit. B) The Sun rotates in the same direction, and spun out the planets as it formed. C) The planets formed from a disk of rotating gas. D) It's a mysterious coincidence: the planets form randomly, so it's a puzzle how they orbit that way.