Boat 1 goes directly across a stream a distance L and back taking a time t1 . Boat 2 goes down stream a distance L and back taking a time t2 . If both boats had the same speed relative to the water, which of the following statements is true?
a. t2 > t1
b. t2 < t1
c. t2 = t1
d. t2 = 2t1
e. t2 = 0.5t1
a
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In video 1 for Chapter 17, how does the fringe spacing change when the distance between the slits, d, is increased?
A. The fringes get farther apart. B. The fringe spacing stays the same. C. The fringes get closer together. D. It depends on how wide the slits are.
An airplane is pointed in the NE direction and is moving 71. m/s with respect to the air. The jetstream (moving air) carries the plane 30. m/s toward the East. What is the velocity of the plane relative to the ground?
What will be an ideal response?
The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12 A, what is the magnitude of the torque exerted
on the loop?
?
?
a.
8.1 N ? m
b.
24 N ? m
c.
22 N ? m
d.
13 N ? m
e.
16 N ? m
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4