Which of the following best describes the image from a plane mirror?
a. virtual and magnification equal to one
b. real and magnification equal to one
c. real and magnification less than one
d. virtual and magnification greater than one
A
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The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line
This diagram is most likely to describe
a.
a swimmer swimming laps.
b.
an exercise on a rowing machine.
c.
a person on a treadmill.
d.
a tennis ball during a volley.
e.
a runner who tripped, fell, rose, and continued racing.
An electron moving in the positive x direction experiences a magnetic force in the positive z direction. If Bx = 0, what is the direction of the magnetic field?
A. negative y direction B. positive y direction C. negative z direction D. positive z direction E. negative x direction
A light beam from a 2.1-mW He-Ne laser has a wavelength of 633 nm. How many photons does the laser emit in one second?
(h = 6.626 × 10-34 J ? s, c = 3.00 × 108 m/s) A) 1.3 × 1016 B) 6.7 × 1015 C) 8.8 × 1015 D) 1.1 × 1016
A length of wire has a resistance of 18.0
When the wire is uniformly stretched to triple it original length, what resistance results?
A. 162
B. 54.0
C. 18.0
D. 6.00
E. 2.00