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Consider an LR circuit with a variable inductor and with deltaVs=150 V, f=60Hz, R=5 ohms. Calculate the power in the resistor when L- 20 mH and when L= 10 mH. This represents the basic cicuit of a magnetic amplifier. In general some small pwer is required to chang inductance but this results in a significant power increase in the load (resistor).
A man slides along a long water slide and then being launched into the air to land in a water pool. Find the magnitude of the velocity at landing
A 4 kg block is acted upon by three horizontal forces. 10n (to left) 5n(short arrow to right) 25n to right. what is the net horizontal force acting on the block? what is the horizontal acceleration of the block?
A proton is initially at rest at a point where the potential is 515V. Sometime later the proton is at a point where the potential is 190V. If no force other than the electrostatic force acts on the proton, what is its final kinetic energy.
An ice cube sliding along the ground at 3 m/s goes off a ramp pointed straight up. What is the speed of the ice cube when it comes down, just before it hits the ground
A wire of length 0.665 m carries a current of 21.0 A. In the presence of a 0.470 T magnetic field, compute the angle between the wire and the magnetic field
What is the stopping distance of the car. What is the initial (horizontal) velocity of the ball.
A lens for a 35-mm camera has a focal length given by f = 54mm, What is the magnification of the image on the film
Charge is scattered uniformly throughout a long cylindrical shell of inner radius R and out radius 2R. At what radius is the electric field equal to one-half the value on the outer surface.
A 60kg pole vaulter running at 13m/s vaults over the bar. Her speed when she is above the bar is 0.7m/s. Neglect air resistance, as well as any energy absorbed by pole, and determine her altitude as she crosses the bar.
Illustrate what is the basis for the industry's legal duty to the surrounding community? In other words, illustrate what is the legal source of the industry's legal duty?
A two-ended "rocket" that is at first stationary on a frictionless floor, with its center an origin of an x axis.
A very large number (N+1) polaroids are arranged in a sandwich, The transmission axis of each polaroid is at a constant angle, with respect to its predecessor
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