A boat at anchor is rocked by waves whose crests are 40 m apart and with wave speed 10 m/s. These waves reach the boat once every
A) 400 s.
B) 30 s.
C) 4 s.
D) 0.25 s.
Answer: C
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Force on a Wire: A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section AB of this coil?
A. perpendicular to and into the page B. perpendicular to and out of the page C. in the direction of the magnetic field D. in the opposite direction of the magnetic field E. The force is zero.
Which of the following telescopes is most suitable for observing cool gas clouds?
A. radio telescope B. visible-light telescope C. X-ray telescope D. All of these choices are correct. E. Cool gas clouds cannot be observed by telescopes.
Interstellar clouds usually form groups of stars that leave the main sequence at the same time.
Answer the following statement true (T) or false (F)
In a RLC circuit, the values of the inductance and capacitance are both doubled. In comparison with the resonance frequency of the original circuit, the new resonant frequency will be
A) the same as before. B) reduced to one-half the original value. C) reduced to one-quarter the original value. D) increased by a factor of two. E) increased by a factor of four.