In an H-R Diagram, the path showing changes in a star's luminosity and surface temperature as a function of time is called its ________
Fill in the blank(s) with correct word
evolutionary track
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The Caloris Basin on Mercury covers a large region of the planet, but few smaller craters have formed on top of it. From this we conclude that
A) erosion destroyed the smaller craters that formed on the basin. B) Mercury's atmosphere prevented smaller objects from hitting the surface. C) only very large impactors hit Mercury's surface in the past. D) the Caloris Basin formed toward the end of the solar system's period of heavy bombardment. E) the Caloris Basin was formed by a volcano.
Weight and g: The mass of Pluto is 1.31 × 1022 kg and its radius is 1.15 × 106 m. What is the acceleration of a freely-falling object at the surface of Pluto if it has no atmosphere? (G = 6.67 × 10-11 N ? m2/kg2)
A. 0.661 m/s2 B. 9.81 m/s2 C. 1.62 m/s2 D. 3.72 m/s2 E. 0.140 m/s2
To make taffy apples, a candymaker buys 100 kg of large apples rather than 100 kg of small apples. That means she will need
A) less taffy. B) more taffy. C) the same amount of taffy.
We have obtained spectra of two hydrogen gas clouds and are studying an emission line that has a laboratory wavelength of 656.3 nm. This emission line appears in Cloud A's spectrum with a wavelength of 660.1 nm and in Cloud B's spectrum at 670.2 nm. What can we conclude about these clouds?
A) They are both moving toward us, and Cloud A is moving faster than Cloud B. B) They are both moving away from us, and Cloud A is moving faster than Cloud B. C) They are both moving away from us, and Cloud B is moving faster than Cloud A. D) They are both moving toward us, and Cloud B is moving faster than Cloud A.