Imagine that, at a certain point in empty space, the curl of the magnetic field has a positive x component. What can we conclude from this information?
A. Ex must be positive at that point.
B. Ex must be negative at that point.
C. Ex must be zero at that point.
D. Ex must be increasing with time at that point.
E. Ex must be decreasing with time at that point.
F. The magnetic field described is not physically possible.
T. None of the above.
D. Ex must be increasing with time at that point.
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The speed of light in a particular transparent medium is 2/8 the speed of light in a vacuum. What is the index of refraction of the material?
a. 1.3 b. 0.75 c. 4 d. 0.25
A point on the rim of a 0.30-m radius rotating wheel has a tangential speed of 4.0 m/s. What is the tangential speed of a point 0.10 m from the center of the same wheel?
a. 1.0 m/s c. 2.7 m/s b. 1.3 m/s d. 8.0 m/s
Physical Pendulum: A simple pendulum that consists of a small ball of mass m and a massless wire of length L swings with a period T. Suppose now that the mass is rearranged so that mass of the ball was reduced but the mass of the wire was increased, with the total mass remaining m and the length being L. What is true about the new period of swing? (There could be more than one correct choice.)
A. The new period is T because the total mass m has not changed. B. The new period is T because the length L has not changed. C. The new period is greater than T. D. The new period is less than T. E. The new period is T because neither L nor m have changed.
The right image was obtained when only part of Io was in sunlight. Based on the colors, which part of the surface was in sunlight?
A) the left side B) the right side C) only the peaks of the volcanoes