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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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
A) bows inward. B) is no different from when the car was at rest. C) bows outward. D) bows inward only when you are driving uphill. E) bows inward only when you are driving downhill.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
The displacement of the tip of the 10 cm long minute hand of a clock between 12:15 A.M. and 12:45 P.M. is:
A. 10 cm, 90° B. 10 cm, 180° C. 10 cm, 4 500° D. 20 cm, 180° E. 20 cm, 540°
A system in equilibrium cannot have
A. any forces on it B. a non-zero velocity C. any torques on it D. a non-zero acceleration
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.