That a planet moves with different speeds in its orbit is given by which of Kepler's laws?
a. First
b. Second
c. Third
d. Fourth
b
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Potential of Point-Charges: A +5.0-µC point charge is 12 cm from a -5.0-µC point charge. What is the magnitude of the electric field they produce at the point on the line connecting them where their electric potential (relative to infinity) is zero? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 0 N/C B. 12.5 MN/C C. 0.75 MN/C D. 25 MN/C E. 1.5 MN/C
In the fusion of low-mass nuclei to make heavier nuclei
A) thermal energy is produced. B) nuclear energy is converted to other forms. C) the final nucleus has a smaller rest-mass than the total rest-mass of the original nuclei. D) All of the above.
A high-resistance material is used as an insulator between the conductors of a length of coaxial cable. The resistance material, which forms a hollow tube, has an inner radius a and an outer radius b, and the insulator provides a resistance R between the conductors. If a second insulator, made of the same material and having the same length, is made with double both the inner radius and the outer
radius of the first, what resistance would it provide between the conductors? a. R b. 2 R c. 4 R d. (ln2)R e. R/(ln2)
A Carnot engine
A. consists of zero heat flow and constant pressure processes. B. consists of only processes which do not involve heat flow. C. consists of only isothermal processes. D. absorbs heat at a single high temperature and rejects heat at a single low temperature. E. consists of constant temperature and constant volume processes.