The main observable difference separating Type I and Type II supernovae is ____
a. neutrino emission
b. iron absorption lines
c. a difference in luminosity of several thousand times
d. the presence or absence of hydrogen absorption lines
e. the presence or absence of hydrogen emission lines
e
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Which of the following statements about comets and asteroids is true?
A) Only asteroids collide with Earth. B) Comets are balls of ice and dust. C) Most of the trillions of comets in our solar system have tails. D) All asteroids lie in the asteroid belt between Mars and Jupiter.
A hypothetical planet has a mass of one-half that of the earth and a radius of twice that of the earth. What is the free-fall acceleration on the planet in terms of g, the free-fall acceleration at the surface of the earth?
A) g B) g/2 C) g/4 D) g/8 E) g/16
Which of the following stellar properties has the greatest range in values?
A) mass B) radius C) core temperature D) surface temperature E) luminosity
A polar bear of mass 200 kg stands on an ice floe that is a uniform 1.0 m thick. What is the minimum area of the floe that will just support the bear in saltwater of density 1030 kg/m3? The density of ice is 980 kg/m3
A) 1.0 m2 B) 2.0 m2 C) 3.0 m2 D) 4.0 m2