If the Earth had twice its present radius and twice its present mass, what change in weight would you experience? Explain
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Answer: If only the radius of the Earth were doubled, you'd have one-quarter your weight. If only the mass of the Earth were doubled, you'd have twice your weight. Taken together, your weight would be half. The gravitational equation nicely guides this answer.
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For a system in mechanical equilibrium, the resultant
A) force must be zero. B) torque must be zero. C) both of these D) none of these
A radioactive substance containing 4.0 × 1016 unstable atoms has a half-life of 2.0 days. What is its activity (in curies, Ci) after 1.0 day? (1 Ci = 3.70 × 1010 Bq)
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Why are elements heavier than iron less abundant than those that are lighter?
A) because the duration of a supernova is relatively short B) because they tend to be unstable, and easily undergo fission C) Spectral evidence suggests they are only rare here on Earth. D) This is one of the mysteries of cosmic formation that has yet to be answered.
Briefly explain the possible threat of near Earth objects
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