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An ac generator emf is E= Em sin wd t, with Em = 30.0 V andwd = 309 rad/s. It is connected to a 17.1 H inductor.
(a) What is the maximum value of the current?
(b) When the current is a maximum, what is the emf of thegenerator?
(c) When the emf of the generator is -15.0 V and increasing inmagnitude, what is the current?
A ship's mast reaches to a height of 15 meters above the surface of a 10-meter- deep lake. When the sun is 30 degrees above the horizon, how long will the shadow of the mast be on the bottom of the lake?
A bead with a mass of 0.050g and a charge of 20nC is free to slide on a vertical rod. At the base of the rod is a fixed 10nC charge. In equilibrium, at what height above the fixed charge does the bead rest?
Which of the following will create a magnetic field? An ion that is slowing down from 500 km/h to 400 km/h. neutron that is speeding up from 1000 m/s to 1200 m/s.
question in the 1950s an experimental train that had a mass of 2.00 104 kg was powered across a level track by a jet
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A wire 83.0 cm long lying along the x axis carries a current of 360.0 mA in the positive x direction, Find the magnitude of the force on the wire
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a 43.3 kg boy and a 60.0 kg girl are on the surface of a frozen lake 10.5 m apart. using a rope the boy exerts a
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The 2000 kg cable car descends a 200-m-high hill. In addition to its brakes, the cable car controls its speed by pulling an 1800 kg counterweight up the other side of the hill. find the runaway car's speed at the bottom of the hill
A lamp hangs vertically from a cord in a descending elevator that decelerates at 1.4 m/s2. If the tension in the cord is 86 N, what is the lamp's mass
What is vertical component of the acceleration
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