An object of mass m is hanging by a string from the roof of an elevator. The elevator is increasing its upward speed. What is the tension in the string?
A. greater than mg
B. less than mg
C. equal to mg
D. depends on the speed of the elevator
A. greater than mg
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In the context of the Hertzsprung-Russell (H-R) diagram, which of the following statements is true of the most massive main-sequence stars?
A) They are the reddest stars. B) They are the coolest stars. C) They are the hottest stars. D) They are the faintest stars.
The ESA's GAIA project will be able to measure parallax and stellar properties of about how many stars?
A) one million B) ten thousand C) one billion D) one hundred billion E) None; it has a different purpose.
A day at the north pole of Uranus lasts:
A) about 7 hours. B) about 8 hours. C) about 21 years. D) about 42 years. E) about 84 years.
In age, Population I stars are typically much ________ than those of Population II
Fill in the blank(s) with correct word