A current may be induced in a coil by
a. moving one end of a bar magnet through the coil.
b. moving the coil toward one end of the bar magnet.
c. holding the coil near a second coil while the electric current in the second coil is increasing.
d. all of the above.
e. none of the above.
d
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Graphical Analysis: Which of the following graphs represent an object at rest? (There could be more than one correct choice.)
A. graph a B. graph b C. graph c D. graph d E. graph e
Suppose it is full moon. What phase of Earth would someone on the Moon see at this time?
A) full Earth B) new Earth C) first-quarter Earth D) Earth does not go through phases as seen from the Moon.
Compared to a cluster containing type O and B stars, a cluster with only type F and cooler stars will be:
A) younger. B) older. C) further away. D) more obscured by dust. E) less obscured by dust.
Bats can detect small objects such as insects that are of a size approximately that of one wavelength. If bats emit a chirp at a frequency of 60 kHz, and the speed of sound in air is 340 m/s, what is the smallest size insect they can detect?