In interactions taking place by the strong force, which of the following quantities are conserved?
a. electric charge
b. baryon number
c. mass-energy
d. strangeness
e. linear momentum
f. angular momentum (spin)
a, b, c, d, e, f
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A segment of wire of total length 3.0 m carries a 15-A current and is formed into a semicircle. Determine the magnitude of the magnetic field at the center of the circle along which the wire is placed
a. 1.6 ?T b. 4.9 ?T c. 1.0 ?T d. 9.8 ?T e. 15 ?T
Gravitational force is greater for a satellite in elliptical orbit when it is at the
A) apogee (farthest point). B) perigee (closest point). C) zenith. D) same acceleration at all of the above places.
Suppose you launch two probes in opposite directions from the Space Station and they meet as they orbit Earth. According to general relativity, why does this happen?
A) They are following the straightest possible paths through spacetime, and those paths curve so that the probes meet. B) They are following the allowed orbits according to Newton's universal law of gravitation. C) The force of gravity tugs on the probes and forces them to orbit the Earth. D) Objects launched in space always follow circular paths, no matter where they are.
A section of DNA that corresponds to a particular protein is known as a
A) codon B) chromosome C) gene D) genome