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2. Ideal single-phase step-down transformer U1 / U2 = 2400/120V. The machine is connected to the grid
electricity with a voltage of 2.6 kV. From the sine shape at this time the steel core is = 0.09sin314tWb.
Determine the number of loops of the primary and secondary wires
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The speed of light in a material is 0.50 c. what is the critical angle of a light ray at the interface between the material and a vacuum?
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As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy
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As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.
Answers: 1
2. Ideal single-phase step-down transformer U1 / U2 = 2400/120V. The machine is connected to the gri...
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