A solid metal wire has a certain resistance. It is heated and carefully stretched to form a longer, thinner wire. After it cools, the resistance is _______ than it was before
a. greater b. less
c. no more d. lighter
a
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Energy in Nuclear Reactions: If a ?- particle at rest decays into a neutron and a ?-, what is the total kinetic energy of the decay products? The masses of ?-, neutron, and ?- are 1197 MeV/c2, 940 MeV/c2, and 140 MeV/c2, respectively.
Fill in the blank(s) with the appropriate word(s).
The diagram above shows the life track of a 1 MSun protostar from the time it first begins to form until it reaches the main sequence, with four stages labeled. What is happening to the protostar's surface temperature and luminosity during Stage 3, when it is undergoing radiative contraction and its life track moves up and to the left?
A) Its surface temperature and luminosity increase. B) Its surface temperature remains the same and its luminosity decreases. C) Its surface temperature and luminosity decrease. D) Its surface temperature decreases and its luminosity increases. E) Its surface temperature and luminosity remain the same.
A student has made the statement that the electric flux through one half of a Gaussian surface is always equal to the flux through the other half of the Gaussian surface. This is
A. never true. B. never false. C. true whenever enclosed charge is symmetrically located at a center point, on a center line, or on a centrally placed plane. D. true whenever no charge is enclosed within the Gaussian surface. E. true only when no charge is enclosed within the Gaussian surface.
To achieve a high equivalent resistance for a pair of resistors, connect them in
A) series. B) parallel. C) either of these