A main-sequence star is observed with a surface temperature of 3500 K and a luminosity 10?2 times that of the Sun. Based on the H-R diagram shown above, what is the approximate mass of this star?
A) 0.2 times that of the Sun
B) 0.5 times that of the Sun
C) 0.9 times that of the Sun
D) 1.5 times that of the Sun
A) 0.2 times that of the Sun
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A stone is thrown horizontally from the top of a tower at the same instant that a ball is dropped vertically. Which object is traveling faster when it hits the level ground below?
A) Neither, since both are traveling at the same speed. B) It is impossible to tell from the information given. C) the ball D) the stone
When the adjustable mirror on the Michelson interferometer is moved 20 wavelengths, how many fringe pattern shifts would be counted?
a. 5 b. 10 c. 20 d. 40 e. 80
According to the nebular theory for the formation of the solar system,
A) planets should be rotating in the same direction as they orbit the Sun B) planets can be rotating in any random direction compared to the direction they orbit the Sun C) planets should be rotating in the opposite direction to the direction they orbit the Sun D) no prediction is made as to the directions of rotations of the planets
Why are supernova explosions important for our existence?
A. They liberate from the star's core the heavy elements of which we and Earth are made. B. They destroy wandering stars that might otherwise collide with our Sun. C. They heat the interstellar medium and help keep Earth warm. D. They sterilized the young Earth and allowed life to originate by killing off competing bacteria. E. They bathe Earth in X-rays that may have helped life form.