How long will it take a charged 80-mF capacitor to lose 20% of its initial energy when it is allowed to discharge through a 45-W resistor?
a. 0.92 ms
b. 0.64 ms
c. 0.40 ms
d. 0.19 ms
e. 0.80 ms
C
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Fourier analysis is something accomplished
A) with all musical instruments. B) automatically by humans. C) both of these D) neither of these
Why did the terrestrial planets lose the majority of the gas in their primary atmospheres?
a. They were too hot and their escape velocities too low to hold onto them. b. The solar wind was too strong and blew these gases off the planets. c. Their high surface temperatures made the gas chemically react with the rock. d. The initial gases were so heavy when the planet differentiated that they sank to the core.
The electric power of a lamp that carries 2 A at 120 V is
A) 1/6 W. B) 2 W. C) 60 W. D) 20 W. E) 240 W.
The British system is a(n) ______________ , or base-12 system
Fill in the blank(s) with correct word