A bar magnet passes through a circular loop of wire as shown below. At the instant that the middle of the magnet passes through the loop, the induced current ( as seen from the coil # 2) is
A. ccw and increasing.
B. cw and decreasing.
C. cw and increasing.
D. zero.
A. cw and increasing.
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How are rotation curves of spiral galaxies determined for orbital distances beyond where starlight can be detected?
A) by extrapolation of the measured rotation curve B) by observations of the 21 cm line of atomic hydrogen C) by observations of spectral lines emitted by dark matter D) by watching the galaxies rotate over a period of decades E) by measuring the broadening of the galaxy's absorption lines
Which types of galaxies have a clearly defined spheroidal component?
A) spirals only B) irregulars only C) lenticulars only D) ellipticals only E) all but irregulars
The near point of a farsighted person's uncorrected eyes is 80 cm. What power contact lens should be used to move the near point to 25 cm from this person's eyes?
A) 2.8 diopters B) -2.8 diopters C) -4.0 diopters D) -4.2 diopters E) 4.2 diopters
The horizontal surface on which the objects slide is frictionless. If F = 12 N, what is the tension in string 1?
a.
35 N
b.
30 N
c.
40 N
d.
45 N
e.
25 N