A conducting bar of length L rotates in a counterclockwise direction with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA ? VB?
a.
+24 mV
b.
?24 mV
c.
+16 mV
d.
?16 mV
e.
+32 mV
a
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Which concept was NOT a part of Kepler's Laws of Planetary Motion?
A) All planetary orbits are ellipses. B) The square of the planet's period is equal to the cube of its average distance. C) A planet must move fastest in its orbit at perihelion. D) Epicycles are needed to explain the varying brightnesses of the planets.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
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You are driving a late model convertible car at the 65 mph speed limit with its soft flexible roof closed up and the windows closed. You observe that the roof
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