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

Physics & Space Science

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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.

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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

Physics & Space Science

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

Physics & Space Science