To observe a spectroscopic binary, we must be able to see both stars individually
a. True
b. False
Indicate whether the statement is true or false
False
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According to the inverse square relation, _____
A) the square of the magnitude of a light source is inversely proportional to the square of its wavelength B) the mass of a star is inversely proportional to the square of its distance from Earth C) the flux you receive from a light source is inversely proportional to the square of the distance to the source D) the temperature of a star is inversely proportional to the square of its visual wavelength when viewed from the source
What was the approximate temperature of the universe at an age of 1015 s?
A) about 1 K B) about 100 K C) about 105 K D) about 1015 K
A 2.0 kg softball is pitched to you at 20. m/s. You hit the ball back along the same path, and at the same speed. If the bat was in contact with the ball for 0.10 s, the average force the bat exerted was
A) 0.40 kN. B) 40. N. C) zero. D) 0.80 kN. E) 0.65 kN.
How is the presence of space debris accounted for by solar system models?
a. Space debris is left over material from the early solar system that never formed into a planet. b. Space debris was formed by the collision of objects after the planets formed. c. Space debris is material that existed in our region of space before the Sun formed. d. Space debris is left over material from the early solar system that never formed into a planet and was formed by the collision of objects after the planets formed. e. All of the other choices are correct.