A steel rod
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In the arrangement shown, a conducting bar of negligible resistance slides along horizontal, parallel, frictionless conducting rails connected as shown to a 2.0-? resistor. A uniform 1.5-T magnetic field is perpendicular to the plane of the paper. If L = 60 cm, at what rate is thermal energy being generated in the resistor at the instant the speed of the bar is equal to 4.2 m/s?
a.
8.6 W
b.
7.8 W
c.
7.1 W
d.
9.3 W
e.
1.8 W
Alan Guth is best known for
The most disorderly arrangement of energy within matter is also
A) the least probable state of matter. B) the most probable state of matter. C) a matter of certainties, not probabilities. D) none of the above
Standing Waves on a String: A 0.588-m string is tightly clamped at both ends. If the lowest standing wave frequency of the string is 326 Hz, how fast do waves travel on this string?
A. 383 m/s B. 475 m/s C. 582 m/s D. 724 m/s