One of the most unexpected aspects of Mars' atmosphere is:
A) that it is 95% carbon dioxide.
B) that its troposphere changes altitude.
C) that it is cloudless.
D) that it contains water vapor clouds.
E) that it has such a low density.
B
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Which of the following provides evidence that all life on Earth shares a common ancestor?
A) All life on Earth shares certain biochemical similarities, including use of DNA as its hereditary molecule. B) All life on Earth requires energy and nutrients to survive. C) All life on Earth requires liquid water to survive. D) All life on Earth shares similarities in appearance that could not possibly be a coincidence.
When we see that a spectral line of a galaxy is broadened, that is, spanning a range of wavelengths, we conclude that
A) we do not have very good resolution of a star's orbital velocity. B) there are many stars traveling at extremely high orbital velocities. C) there are different Doppler shifts among the individual stars in the galaxy. D) we are actually measuring the orbital velocity of a cloud of atomic gas. E) we are actually measuring the orbital velocity of dark matter.
Underlying the concept of self-induction is
A) Ohm's law. B) Faraday's law. C) Maxwell's law. D) all of these about equally
A metal bar is used to conduct heat. When the temperature at one end is 82.0°C and at the other is 37.0°C, heat is transferred at a rate of 9 J/s. If the temperature of the hotter end is reduced to 55.7°C, what will be the rate of heat transfer?
a. 2.7 J/s b. 1.6 J/s c. 6.2 J/s d. 3.7 J/s e. 5.0 J/s