Iridium is an element that is relatively
A) abundant on Earth, but very rare in meteorites.
B) rare on Earth, but very common in meteorites.
C) abundant on both the Earth and the Moon.
D) rare on both Earth and in meteorites.
Answer: B
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The change in internal energy of adding 100 joules to a system that does 60 joules of work is
A) 0 J. B) 40 J. C) 60 J. D) 100 J. E) none of the above
What is the meaning of a "closed" universe?
A) The universe will expand forever. B) The universe will someday stop expanding and start to collapse. C) The universe will stop expanding in an infinite amount of time. D) The universe is in a steady-state. E) The universe will disappear into a white hole in time.
Which of the following did NOT contribute to the thinning of the Martian atmosphere during its early history?
A) the photodissociation of water molecules by ultraviolet light in the atmosphere B) the stripping of the atmosphere by solar wind particles from the Sun C) the consumption of carbon dioxide by photosynthetic bacteria D) atmospheric gases being blasted into space by large impacts
Suppose working outside on a hot day someone generate 450 J of heat each second. If this energy is compensated for by the evaporation of sweat, how much water would be lost in an hour? The latent heat of fusion for water is 334 kJ/kg and for vaporization is 2,200 kJ/kg
a. 4.85 liter c. 0.50 liter b. 0.74 liter d. 1.5 liter