The radius of a nucleus is typically:
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Force on a Wire: A rectangular coil, with corners labeled ABCD, has length L and width w. It is placed between the poles of a magnet, as shown in the figure If there is a current I flowing through this coil in the direction shown, what is the direction of the force acting on section BC of this coil?
A. perpendicular to and into the page B. perpendicular to and out of the page C. in the direction of the magnetic field D. in the opposite direction of the magnetic field E. The force is zero.
Resistance and Resistivity: Consider two copper wires of equal length. One wire has twice the cross-sectional area of the other. How do the resistances of these two wires compare?
A. The thicker wire has twice the resistance of the thinner wire. B. The thicker wire has eight times the resistance of the thinner wire. C. The thicker wire has one-half the resistance of the thinner wire. D. The thicker wire has four times the resistance of the thinner wire. E. The thicker wire has one-fourth the resistance of the thinner wire.
If the surface area of a sphere is increased by 16%, by what percentage has the radius been changed?
A. 16% B. 8.1% C. 7.7% D. 12%
What is at the center of the Milky Way?
A: A supermassive (> 1 million solar masses) black hole B: A cluster of young, hot stars zooming around C: The center of the bulge/bar D: The loud radio source known as Sag A* E: All of the above