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Q1. Two diodes and a resistor are placed in a single loop circuit connected to an AC generator. The diodes are oppositely oriented, so that when one diode is forward-biased, the other is back-biased. Which phrase best describes the current in the circuit?
A) Nonzero and changing direction with time.
B) Nonzero and constant
C) Nonzero and changing magnitude with time.
D) Efficiently zero at all times.
Q2. A crane lifts a 425 kg steel beam vertically upward a distance of 59 m. How much work does crane do on the beam if the beam accelerates upward at 1.8 m/s^2? Avoid frictional forces.
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A person wears a hearing aid that uniformly increases the intensity level of all audible frequencies of sound by 29.7 dB. The hearing aid picks up sound having a frequency of 250 Hz at an intensity of 3.10 10-11 W/m2. What is intensity delivered to t..
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While Voyager 2 sent back pictures of Neptune during its historic flyby of that planet in 1989, the spacecraft's radio signals travelled for 4 hours at the speed of light to reach Earth. How far away was the spacecraft.
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