Why is Venus's day so long (a day-night cycle on Venus lasts for as long as 243 Earth day and night cycles)?
A. No one knows the reason.
B. Venus's rotation time is very long compared to the time it takes to go once around the Sun.
C. Because Venus's year is longer than a year on Earth.
D. Venus's rotation time is very short compared to the time it takes to go once around the Sun.
E. Because Venus's year is shorter than a year on Earth.
Ans: B. Venus's rotation time is very long compared to the time it takes to go once around the Sun.
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How did Harlow Shapley use the period-luminosity relationship of RR Lyrae variables to determine the size of the Milky Way galaxy?
a. He determined the proper motion of globular clusters in the outer disk of the galaxy. b. He found the distances to individual variables free floating in the halo. c. He found the distances to open clusters found throughout the disk of the galaxy. d. He found the distances to globular clusters distributed about the center of the galaxy.
According to current models of solar system formation, why did Uranus and Neptune end up to be much less massive than Jupiter and Saturn?
A) Particles in the solar nebula were more spread out at greater distances, so that accretion took longer and there was less time to pull in gas before the solar wind cleared the nebula. B) Ices were able to condense at the distance of Jupiter and Saturn, but only rock and metal could condense at the distances of Uranus and Neptune. C) The solar nebula had different chemical composition at different distances from the Sun, leading to the differences in mass. D) The size differences are thought to be a random coincidence.
Which requires more work on the brakes of a car?
A) slowing down from 100 km/h to 70 km/h B) slowing down from 70 km/h to a stop C) equal amounts of work for either
When the input piston of a hydraulic press is depressed 20 cm, the output piston is observed to move 1 cm. An input force of 1 N can raise no more than
A) 1 N. B) 10 N. C) 20 N. D) 21 N.