Which was the last part of the planet-forming process?
A. formation of the planetesimals
B. formation of the planets' core
C. formation of the atmosphere of the planets
D. formation of the Sun
Answer: C
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Which mission has recently provided scientists with information about Mercury's magnetic field?
a. Magellan b. MESSENGER c. LCROSS d. Voyager e. Apollo
Western Europe has a standard of living similar to the U.S., while per capita energy use is only about half that of the U.S. If the U.S
could be about as energy-efficient as Western Europe, how much energy could be saved in the American economy? Would this help us meet the Kyoto Climate Treaty reductions (a return to 1990 emissions levels)? Explain. What would the projected energy necessary to raise the entire world to the European standard be?
The Schwarzschild radius of a 1-Mo black hole is approximately
a. 3 km. b. 1,500,000 km, the size of the Sun. c. 150,000,000 km or 1 AU. d. 3 × 10^13 km or 1 pc.
An 825-kg space vehicle is circling Earth in a circular orbit with a radius of 10,300 km. Its orbit is to be changed to a larger circle with a radius of 17,400 km. How much energy is required to accomplish this?
The mass of Earth is 5.97 × 1024 kg and G = 6.67 × 10-11 N ? m2/kg2. A) 1.00 × 109 J B) 1.30 × 1010 J C) 6.51 × 109 J D) 4.45 × 109 J E) 4.50 × 1010 J