The inductor in an LR circuit initially carries a current I0 and therefore contains a certain amount of energy in its magnetic field. By the time that the current has decayed to half its initial value, what fraction of the inductor’s magnetic field energy has been converted to thermal energy in the circuit’s resistor?
A. 7/8
B. 3/4
C. 1/2
D. 1/4
E. 1/8
F. Some other fraction (specify).
B. 3/4
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Constant Angular Acceleration: A bicycle wheel has an initial angular speed of 7.2 rad/s. After turning through one-half of a revolution, the angular speed is reduced to 2.2 rad/s. If the angular acceleration of the wheel was constant during the motion, how long will it take the wheel to make the one-half revolution?
Fill in the blank(s) with the appropriate word(s).
A 1.1kg seagull takes off from a piling along the California coast and accelerates within 0.50s to a flight speed of 7.5m/s along a horizontal path. What average power was developed by the bird’s wings as it accelerated?
A. 62W B. 8.3W C. 33W D. 250W
Linus claims that the added gravitational force of neutrons holds the particles in a nucleus together. Linnea says that they stick together because they lose their electric charge when they form a nucleus. Which one, if either, is correct, and why?
a. Linus, because more particles exert gravitational forces on one another than exert electromagnetic forces. b. Linus, because the numerical magnitude of G/ke is 7.42 × 10^-21. c. Linnea, because the numerical magnitude of G/ke is 7.42 × 10^-21. d. Both, because electric charge is lost and then gravity holds the nucleus together. e. Neither, because gravity is not lost, and the numerical magnitude of ke/G is 1.35 × 10^20.
The melting point of silicate minerals is strongly dependent on the amount of silica it contains. The first minerals to melt are those with
What will be an ideal response?