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.
B) Comets are balls of ice and dust.
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What is the approximate temperature of the Sun's core?
A) 5800 K B) 10,000 K C) 1 million K D) 15 million K E) 150 million K
Two identical vertical springs S1 and S2 have masses m1 = 400 g and m2 = 800 g attached to them. If m1 causes spring S1 to stretch by 4 cm, what is the ratio of the potential energy of S1 and S2? Use g = 10 m/s2
A) 2:1 B) 1:2 C) 1:3 D) 4:1 E) 1:4
What does the CNO cycle and the hydrogen proton-proton cycle have in common? Choose the best answer to the question
A) They both trigger at the same temperature. B) They both are ways to fuse hydrogen nuclei to make helium. C) They are both cycles in star lives. D) They are both nuclear reactions; the CNO cycle makes carbon, nitrogen, and oxygen, and the proton cycle makes helium.
A 2.00-m-long 6.00-kg ladder pivoted at the top hangs down from a platform at the circus. A 42.0-kg trapeze artist climbs to a point where her center of mass is at the center of the ladder and swings at the system's natural frequency. The angular frequency (in s?1) of the system of ladder and woman is
a. 1.01. b. 3.07. c. 4.03. d. 8.05. e. 16.2.