What mass of 14C (having a half-life of 5730 years) do you need to provide a decay rate of 280.0 Bq? (1 u = 1.6605 × 10-27 kg)
A) 1.70 × 10-12 kg
B) 5.38 × 10-19 kg
C) 3.84 × 10-20 kg
D) 8.68 × 10-13 kg
A
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What makes refrigerators and air conditioners possible, in view of the second law of thermodynamics?
a. The fact that heat naturally moves from cooler regions to hotter ones. b. The addition of mechanical work to the system. c. The chance occurrences of heat flow from cooler to hotter systems. d. The use of electricity, not heat. e. The fact that no energy is wasted as heat in this kind of system.
Why would the tidal forces around a black hole be of concern to a space explorer interested in investigating the area near a black hole?
What will be an ideal response?
Four of following are factors that must be overcome by a large molecular cloud before gravitational contraction can begin. Which one is the exception??
A. thermal energy of gas B. magnetic fields C. rotation of gas clouds D. intense radiation from a nearby star
Planet A has twice the mass of Planet B. From this information, what can we conclude about the free-fall acceleration at the surface of Planet A compared to that at the surface of Planet B?
A) The free-fall acceleration on Planet A must be twice as great as the free-fall acceleration on Planet B. B) The free-fall acceleration on Planet A must be four times as great as the free-fall acceleration on Planet B. C) The free-fall acceleration on Planet A is the same as the free-fall acceleration on Planet B. D) The free-fall acceleration on Planet A is greater than the free-fall acceleration on Planet B, but we cannot say how much greater. E) We cannot conclude anything about the free-fall acceleration on Planet A without knowing the radii of the two planets.