If a particle with a charge of 2 coulombs moves through a potential difference of 12 volts, its change in kinetic energy will a have magnitude of
A)
12 J.
B)
6 J.
C)
8 J.
D)
1/6 J.
E)
24 J.
E
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Molly measures a Hubble constant of 20 km/sec/million light-years. Sam measures a Hubble constant of 25 km/sec/million light-years. All other assumptions being the same, which person would estimate a LARGER age to the universe?
A) Sam B) Molly C) They both would measure the same age.
Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at the point exactly between the two wires
A) points up. B) points down. C) points toward you. D) points away from you. E) is zero.
Optical fibers work because of
a. interference b. diffraction c. total internal reflection d. diffuse reflection e. polarization
What observation made of other stars seems to suggest the solar nebula theory is correct?
a. Stars are found to exist more often in binaries than by themselves. b. Protostars are seen to radiate much of their light at infrared wavelengths. c. Nearby stars tend to be low-mass red dwarfs. d. Young stars are found to have hot disks that surround them.