Suppose that a symmetry argument of some kind tells us that the electric field in a certain region points directly away from the nearest point on the y axis and has a magnitude that depends only on r, the distance to that nearest point. For which of the gaussian surfaces listed, would it be easiest to calculate the net flux of the electric field through that surface?
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis.
B. A spherical surface.
C. A cylindrical can-like surface oriented with its central axis perpendicular to the y axis.
D. A cylindrical can-like surface oriented with its central axis parallel to the y axis.
E. A cone-like surface oriented with its central axis parallel to the y axis.
A. A cubical surface oriented so that two opposite faces are perpendicular to the y axis.
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Which fundamental fact about the electromagnetic force explains why electromagnetic waves exist, rather than simply electromagnetic force?
A) The electromagnetic force acts at a distance with a delay time, rather than instantaneously. B) The electromagnetic force decreases at points more distant from the source of that force. C) The electromagnetic force can be felt in all directions from the source of that force. D) The electromagnetic force cannot be felt across vacuum. E) The electromagnetic force acts instantaneously at a distance, with no delay time.
The major influence on the tides is due to __________
Fill in the blank(s) with correct word
Suppose that a rigid aluminum wire were to be strung out in a loop that just fits snugly around the equator (assuming a perfectly spherical Earth with a radius of 6.37 × 106 m)
If the temperature of the wire is increased by 0.50°C, and the increase in length is distributed equally over the entire length, how far off the ground will the wire loop be if it remained centered on the earth? The coefficient of linear expansion of aluminum is 24 × 10-6 K-1. A) 76 cm B) 760 m C) 76 mm D) 7.6 mm E) 76 m
A hoop is rolling without slipping along a horizontal surface with a forward speed of 5.50 m/s when it starts up a ramp that makes an angle of 25.0° with the horizontal
What is the speed of the hoop after it has rolled 3.00 m up as measured along the surface of the ramp? A) 4.22 m/s B) 1.91 m/s C) 2.06 m/s D) 3.79 m/s E) 8.02 m/s