In the equation A = B/C, the A and B are said to be _______________ proportional
a. directly
b. inversely
c. not
d. exactly
a
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The electric resistance of a superconductor is
A) zero. B) infinite. C) usually lower than ordinary resistors. D) none of the above
A negative muon decays to form an electron and a mu neutrino and one additional particle. The other particle must be a(n)
a. positron. b. antineutrino. c. neutrino. d. photon.
Which of the following is not a major idea of Einstein's general theory of relativity?
A) Time runs slower near strong gravitational fields. B) It is possible to travel through wormholes. C) Our universe can have no center or boundaries, yet be finite. D) Black holes can exist in spacetime, and falling into a black hole means leaving the observable universe.
A 25-g traffic light hangs midway on a cable between two poles 40 meters apart. If the sag in the cable is 0.40 meters, what is the tension in each side of the cable?
a. 12,200 N c. 4900 N b. 9800 N d. 6100 N