What is the force exerted by the Sun on the earth? The mass of the Sun is 1.99 × 1030 kg, the mass of the earth is 5.97 × 1024 kg, the Earth-Sun distance is 1.50 × 1011 m, and G = 6.67 × 10-11 N m2/kg2
A)
5.28 × 1033 N
B)
3.52 × 1022 N
C)
8.85 × 108 N
D)
7.25 × 1019 N
E)
9.32 × 1011 N
B
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Which of the following planets has the highest uncompressed density?
A) Mars B) Venus C) Mercury D) Earth
What was needed to develop in Earth's atmosphere to protect organisms from the harmful effects of ultraviolet radiation?
a. weather patterns b. a nitrogenous layer c. a greenhouse effect d. an ozone layer e. reflective clouds
Which of the following statements is true?
A. Low-mass stars cannot produce neon. B. Low-mass stars can fuse heavier elements by the triple-alpha process and neutron capture. C. Planetary nebulae are an important source of interstellar carbon and nitrogen. D. All of these choices are correct.
A gasoline engine absorbs 2500 J of heat at 250°C and expels 2000 J at a temperature of 50°C. What is the magnitude of the change in entropy (in J/K) for the system?
a. 6.2 b. 4.7 c. 1.4 d. 10.9 e. 3.2