Newton's second law states that if an unbalanced force acts on an object, it will move at constant velocity
a. true
b. false
Answer: b. false
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Two white dwarf stars are the same size, but one has a surface temperature twice as hot as the other. The hotter star will radiate
a. half as much energy per second as the cooler star. b. the same amount of energy per second as the cooler star. c. four times as much energy per second as the cooler star. d. sixteen times as much energy per second as the cooler star.
What is an accretion disk?
A) a disk of hot gas swirling rapidly around a white dwarf, neutron star, or black hole B) any flattened disk in space, such as the disk of the Milky Way Galaxy C) a stream of gas flowing from one star to its binary companion star D) a disk of material found around every white dwarf in the Milky Way Galaxy
Most astronomers now regard Pluto as the largest ________, and NOT a planet
Fill in the blank(s) with correct word
Which of the following stars has a spectrum that peaks at the highest frequency?
A) a blue star B) a red star C) a yellow star