The second law of thermodynamics implies
that
a) heat can be used to do work only if a thermal reservoir at a lower temperature is available.
b) the total energy of a body is the sum of kinetic energies of all its molecules.
c) bodies cool at rates proportional to their temperature excess above their surroundings.
d) energy cannot be destroyed.
Question 2
A uniform rod (length = 2.0 m) is mounted to rotate freely about a horizontal axis that is perpendicular to the rod and that passes through the rod at a point 0.50 m from one end of the rod. If the rod is released from rest in a horizontal position, what is the angular speed of the rod as it rotates through its lowest position?
a. 3.5 rad/s
b. 3.8 rad/s
c. 4.1 rad/s
d. 2.0 rad/s
e. 5.6 rad/s
The greenhouse effect: heat trapping by earth's atmosphere.
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