A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
a. 23° west of north
b. 20° west of north
c. 24° west of north
d. 22° west of north
e. 17° west of north
d
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In Young's two-slit experiment, a beam of light from a slit reaches at a point on the screen one wavelength behind the wave from the other slit. What is observed on the screen at that point?
A) Dark fringe B) An empty space C) Bright-dark fringe D) Dark-bright fringe E) Bright fringe
A series LC circuit contains a 100-mH inductor, a 36.0-mF capacitor and a 12-V battery. The period of the electromagnetic oscillations in the circuit is
a. 0.0227 s. b. 0.377 s. c. 2.26 s. d. 105 s. e. 1750 s.
If a conductor is in electrostatic equilibrium near an electrical charge:
a. the sum of all forces between the conductor and the charge must be zero. b. the total charge on the conductor must be zero. c. any charges on the conductor must be uniformly distributed. d. the electric field inside the conductor must be zero.
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