The jovian planets are thought to have formed as gravity drew hydrogen and helium gas around planetesimals made of __________.
a. only rocks and metals
b. only ices
c. rocks, metals, and ices
d. rocks, metals, ices, and hydrogen and helium gases
Answer: c. rocks, metals, and ices
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Matter falling into a black hole arranges itself in the shape of a ____
a. spherical shell that is thick at the edges and thin closer to the center b. spherical shell that is thin at the edges and thick closer to the center c. disk that is thick at the outer edge, thin along the inner ring d. disk that is thin at the outer edge and thick closer to the center e. disk that is thin from the outer edge to the center
Springs: It takes 87 J of work to stretch an ideal spring from 1.4 m to 2.9 m from equilibrium. What is the value of the spring constant (force constant) of this spring?
A. 27 N/m B. 77 N/m C. 52 N/m D. 39 N/m
A block of ice at 0°C is added to a 150. g aluminum calorimeter cup that holds 200. g of water at 10°C. If all but 2. g of ice melt, what was the original mass of the block of ice?
A) 47.6 g B) 38.8 g C) 62.2 g D) 42.0 g E) 31.1 g
Betelgeuse is a star in the constellation Orion. It radiates heat at the rate of 3.00 × 1030 W and has a surface temperature of 3000 K
Assuming that it is a perfect emitter, what is the radius of Betelgeuse? The Stefan-Boltzmann constant is 5.67 x 10-8 W/(m2•K4). A) 7.80 × 1010 m B) 8.70 × 1010 m C) 1.40 × 1011 m D) 1.90 × 1011 m E) 2.30 × 1011 m