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.
a
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All the following statements about Mars are true. Which one might have led to a significant loss of atmospheric gas to space?
A) Mars lost any global magnetic field that it may once have had. B) The axis tilt of Mars is thought to change significantly with time. C) Outgassed water molecules are split apart, and the oxygen then reacts chemically with surface rock on Mars. D) Mars probably once had a much higher density of greenhouse gases in its atmosphere than it does today.
Four electrons move from point A to point B in a uniform electric field as shown below. Rank the electrons in diagrams I through IV by the changes in potential from most positive to most negative when traveling from A to B.
A. I = II = III = IV. B. II = III > I > IV. C. III > I = IV > II. D. II > I = IV > III. E. I > II = III > IV.
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2. What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
A. 3.8 N/C B. 4.1 N/C C. 3.5 N/C D. 3.2 N/C E. 0.28 N/C
A thin ribbon of a silver alloy 2.00-cm wide and 0.015 0-mm thick carries a current of 6.98 A perpendicular to a magnetic field. The Hall voltage is found to be 1.24 × 10^?4 V when the magnetic field is 2.50 T. Calculate n, the number of charge carriers per cubic meter