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The step-down transformer in a local neighborhood reduces the voltage from a 7,200 V line to 120 V.
(a) If there are 125 loops on the secondary, how many are on the primary coil?
A conducting spherical shell with inner radius a and outer radius b has a positive charg Q located at its center. derive expressions for the electric field magnitude in terms of the distance r from the center
A student sits on a freely rotating stool holding two weights, each of mass 2.90 kg. When his arms are extended horizontally, Find the new angular speed of the student
A shot put is released with a horizontal velocity of 12 m/s and stays in the air for 2.0 seconds At what angle with the horizontal was it released
A charge -305e is uniformly distributed over one face of a circular disk of radius 2.90 cm. What is the surface charge density over that face
electric field of a sinusoidal electromagnetic wave obeys the equation \(E=-(375V/m) sin((5.97*10^{15}rad/s)t+(1.99*10^7rad/m)x)\), What is the amplitude of the electric field of this wave
An RL circuit with L = 3 H and an RC circuit with C = 5 µF have the same time constant, What is this common time constant
A proton (mass 1 u) moving at 5.40 *10^6m/s collides elastically and head-on with a second particle moving in the opposite direction at 2.60 106 m/s. Find the mass and final velocity of the second particle
A 45-kg crate is placed on an inclined ramp. When the angle the ramp makes with the horizontal is increased to 25 degrees , At what angle does the crate begin to slide
A transformer on a pole near a factory steps the voltage down from 3600 V (rms) to 120 V (rms). determine the power delivered to the primary
A motor may be modeled as a series RL circuit. A particular motor operates from an ordinary 60-Hz wall outlet with Erms= 115 V. what is the inductive reactance of the circuit
A constant 0.28 T magnetic field passes through a loop at an angle of 35 degrees with respect to the normal of the area of the loop. find the flux through the loop
A billiard ball moving at 6.00 m/s strikes a stationary ball of the same mass. After the collision, the first ball moves at 5.12 m/s at an angle of 31.5° with respect to the original line of motion. find the struck ball's velocity after the collisi..
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