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Under high-signal test conditions, a certain audio amplifier supplies a 24 V rms 1-kHz sinusoidal voltage to an 8 ohm load. The power supply delivers 4 A at a voltage of 50 V to the amplifier. The signal power supplied by the input source is negligible. Determine the efficiency and the power dissipated in the amplifier.
A meterstick is at rest in an inertial frame S2. If S2 moves with a speed of 0.7c with respect to a rest frame S1, find the length of the meterstick as measured in frame S1 according to classical physics. Reply in units of m.
Find the total power radiated out into space by the Sun assuming it to be at a temperature of 5500 K and the emissivity is 1
You toss a conductive open ring of diameter d = 2.65 cm up in the air. The ring is flipping around a horizontal axis at a rate of 7.25 flips per second. What is the maximum emf induced in the ring
A helicopter is ascending vertically with a speed of 5.45m/s. At a height of 141m above the Earth, a package is dropped from a window. How much time does it take for package to reach the ground.
A hockey puck impacts a goalie's plastic mask horizontally at122 m/h and rebounds horizontally off the mask at 47mi/h. Find the average force that the puck exerts on the mask
Several people are riding in a hot-air balloon. The combined mass of the people and balloon is 348 kg. how much mass should be dropped overboard
The amount of heat released when 3.5 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is __________ J.
The extracellular fluid volume varies with the size of the person. What is the total amount of Na+ in the ECF
A girl is whirling a ball on a string around her head in ahorizontal plane. She wants to let go at precisely the right timeso that the ball will hit a target on the other side of the yard. When should she let go of the string
The height of a helicopter above the ground is given by h = 2.80t3, where h is in meters and t is in seconds. How long after its release does the mailbag reach the ground
Estimate the flow rate of water (in m3 per sec) needed for a 1 GigaWatt hydroelectric power plant.
A 82 kg student sits on a chari which is soley supported by a solid 0.92 meter long steel rod 0.98 cm in diameter
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