Two identical silver spheres of mass m and radius r are placed a distance R (sphere 1) and 2R (sphere 2) from the Sun, respectively. The ratio of the gravitational force exerted by the Sun on sphere 1 to the pressure of solar radiation on sphere 1 is T1; the ratio for sphere 2 is T2. The ratio of T2 to T1 is
A. 0.25.
B. 0.50.
C. 1.0.
D. 2.0.
E. 4.0.
Answer: C
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Carbon-14 has a half-life of 5730 y. A sample of wood has been recovered by an archaeologist. The sample is sent to a laboratory,
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Fill in the blank(s) with correct word
According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them will
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