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An AC adapter for a telephone answering machine uses a transformer to reduce the line voltage of 120 V to a voltage of 7.00 V. The RMS current delivered to the answering machine is 740 mA. If the primary (input) coil of the transformer has 600 turns, then how many turns are there on the secondary (output) coil?
What is the power drawn from the electric outlet, if the transformer is assumed to be ideal?
What is the power drawn by the transformer, if 16.5 percent of the input power is dissipated as heat in the coils and in the iron core of the transformer?
A person holds a ladder horizontally at its center. Treating ladder as a uniform rod of length 3.30 m and mass 7.43 kg, find out the torque the person must exert on the ladder to give it an angular acceleration of 0.405 rad/s2.
A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 3.4.0 min, what is the average power generated by the child
Big yellow fishing swimming at 2.0m/s swallows little green fish at rest. What fraction of big yellow fish's initial kinetic energy was lost is this collision
A car changes it speed from rest to 12 km/hr in 4sec .If the mass of the car is 2000 killograms what is the net force acting on the car
A drag racer crosses the finish line doing 216 mi/h and promptly deploys her drag chute, What force must the drag chute exert on the 850 kg car to slow it to 45.2 mi/h in a distance of 161 m
An air bubble has a volume of 1.25 cm3 when it is released by a submarine 100 m below the surface of a lake. What is the volume of the bubble when it reaches the surface
At one point in a pipeline, water's speed is 3.30 m/s and the gauge pressure is 4.00×10^4 Pa. Find out the gauge pressure at a second point in the line 13.0 m lower than the first if the pipe diameter at the second point is twice that at the first.
Calculate the momentum pi at the end of the plane in terms of the measured quantities x, y, L, and m. how far will it coast back up the ramp before changing directions
A bumper car with mass m1 = 129 kg is moving to the right with a velocity of v1 = 4.50 m/s. A second bumper car with mass m2 = 86.0 kg is moving to the left with a velocity of v2 = -3.6 m/s. The two cars have an elastic collision. Suppose the surface..
Suppose the charge of one is increased by twenty seven times while the charge of the other is reduced to one-third its initial value. What would their separation distance have to be changed to in order to keep the force between them the same?
Two equal forces act on the two different objects, one of which has a mass ten times as large as the other. Will the more massive object have the larger acceleration, an equal accelearation, or a smaller acceleration.
What least amount heat is needed to bring 20-g of water at 20C to the boiling point and completely boil it away.
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