Discuss your understanding of the author's meaning in the statement, referring to efficiency of a hydrogen economy that "if solar energy is the source of the energy
, the efficiency" of the hydrogen energy production system "is of less concern."
Renewable energy is available in large amounts from the Sun and wind. The
energy is free, really free of cost, and so any inefficiencies have little economic impact.
Because solar energy would deposit its energy on Earth in any case, there is no concern
about waste heat.
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In size, Mercury is intermediate between:
A) Earth and Venus. B) Mars and Earth. C) the Moon and Mars. D) Pluto and the Moon. E) Ceres and Pluto.
An aluminum wing on a plane is 38 m long when the temperature is 20 oC. At what temperature (in oC) would the wing be 0.04 m shorter? Enter your answer to one decimal place. You should think about the physics of the situation before trying to solve the problem. (Hint: You are being asked for a temperature, not a temperature change)
Isaac Newton was able to estimate a value for G, the universal gravitational constant, from the following data: the radius of the Earth is about 6 400 km, the average density of rocks is about 5.50 g/cm3, and g = 9.80 m/s2 near the surface of the Earth. What value did Newton obtain for G?
Fission is used in
a. atomic bombs. b. power plants. c. energy for stars. d. hydrogen bombs. e. a tokamak reactor.