Which of the following is an almost reversible process?
a. The explosion of hydrogen and oxygen to form water.
b. Heat transfer through thick insulation.
c. The adiabatic free expansion of a gas.
d. A slow isothermal compression of a gas.
e. A slow leakage of gas into an empty chamber through a small hole in a membrane.
d
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The necessary chemical elements of life should
A) only be found on the Earth and Mars B) be widespread in the solar system but not elsewhere in our Milky Way galaxy C) be widespread throughout the universe D) be widespread in our Milky Way galaxy but not in other galaxies
Higher mass protostars enter the main sequence:
A) faster and at a higher luminosity and temperature. B) faster and at a lower luminosity and temperature. C) slower and at a higher luminosity and temperature. D) slower and at a lower luminosity and temperature. E) at the same rate, but at a higher luminosity and temperature.
Moh's hardness scale is a relative measure of which physical property of minerals?
What will be an ideal response?
Imagine that a certain engine can cause the road to exert a certain maximum forward force on a certain car. If we change the car’s design to reduce its drag coefficient by a factor of 2, by what factor will the car’s maximum speed increase (other things being equal)?
A. No increase B. 1.41 C. 2 D. 4 E. Depends (specify) F. Other (specify)