By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
a. straight lines in space that go from one magnetic charge to another.
b. straight lines in space that are parallel to the wire.
c. straight lines in space that are perpendicular to the wire.
d. circles that have their centers on the wire and lie in planes perpendicular to the wire.
e. circles that have the wire lying along a diameter of the circle.
d
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Astronomers have defined a(n) _______________ around a star as a region within which planets that orbit there have temperatures permitting the existence of liquid water
Fill in the blank(s) with correct word
A tuning fork is sounded above an adjustable length resonating tube (one end closed), which resonates at a length of 0.250 m and again at 0.750 m. What is the frequency of the fork when the speed of sound is taken to be 340 m/s?
a. 340 Hz c. 1020 Hz b. 680 Hz d. 170 Hz
A harmonic longitudinal wave propagating down a tube filled with a compressible gas has the form s(x, t) = smcos(kx ? ?t). Its velocity can be obtained from
a. ?/k b. k/? c. k d. ? e. ?k
If the Earth had four times its present mass, what would be its new period of revolution around the sun, compared to its present orbital period?
A) two times as much B) one-fourth as much C) four times as much D) one-half as much E) the same