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1. A power station delivers 750 kW of power at 12,000 V to a factory through wires with total resistance of 3 W. How much less power is wasted if electricity is delivered at 50,000 V?
2. The current in an electromagnet connected to a 240 V line is 17.5 A. At what rate must cooling water pass over the coil if water temperature is to rise no more than 6.5 K?
A 145 O resistor is connected in series with a 5.75 µF capacitor. The voltage across the resistor is vR=(1.20V)cos(2500rad/s)t.
an anatomist is viewing heart muscle cells with a microscope that has two selectable objectives with refracting powers
how far from the base of the cliff will the ball land
A clock has a second hand whose tip rubs against the inside of the glass cover. what is the minimum torque that must be applied to the second hand
A jet moving 500.0 km/h due east is in a region where the windis moving at 120.0 km/h in a direction 30.00 degrees north of east. What is the speed of the aircraft relative to the ground
The wire fastened to the ceiling is also very light, has a tension of 49 N and makes an angle ? with the ceiling.
design a spatial filter to be placed in the fraunhofer plane of a 1.00 m focal length lens if the optical system is
an electron of mass 9.11x10-31 kg has an initial speed of 2.40x105 ms. it travels in a straight line and its speed
You are standing on a canyon edge and you give a shout. After 4.9 s have passed, you hear your echo. Determine how far away the cliff wall is that your voice bounced off of
A railroad car of mass 3.5*104 kg moving at 3.50 m/s collides and couples by two coupled railroad cars, each of the same mass as the single car and moving in the similar direction at 1.20 m/s. How much kinetic energy is lost in the collision?
a skier starts from rest at the top of a hill. the skier coasts down the hill and up a second hill. the crest of the
a worker drags a 310 kg crate at a constant velocity of 3 m/s, across a factory floor by pulling on a rope tied to the crate. What is the acceleration of the crate
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