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A transformer has 4500 turns on a primary coil turns 30,000 turns on the secondary coil. If the secondary coil shows 2.5A of current under 400V and is 100% efficiency find the voltage and current of the primary coil
If the new efficiency drops to 80% what is the new primary power if the output power on secondary coil is 10,000 W
A family ice show is held in an enclosed arena. The skaters perform to music playing at a level of 84.5 dB. Determine what total sound intensity engulfs you
A 2.1-m-tall, 90-cm-diameter concrete column supports a 4.0×10^5kg load. By how much is the column compressed
A capacitor is made from a thin wire of charge density lsurrounded by material with dielectric k = 2 to a radius a, What is the capacitance per unit length of this geometry
what is the electric field amplitude associated with the light from a red laser pointer? assume power0.10mw with a
An unknown substance has a mass of 0.125 kg and an initial temperature of 99.4°C. The substance is then dropped into a calorimeter made of aluminium containing 0.285 kg of water initially at 27.6°C. The mass of the aluminium container is0.150 kg, and..
A fine metal foil separates one end of 2 pieces of opticallyflat glass, How thick is the foil
Compute the momentum of the bullet
A ball is thrown vertically upward and caught 20 seconds later at the same point from which it was released. what was the ball's initial velocity
A student with a mass of 50.0 kg runs up threeflights of stairs in 10.0 sec. Determine the amount of work done by the student to elevate his body to this height
A uniform rod of mass 2.15kg and length 3.49m is hinged on one end to the wall. The other end is held up by a rope which makes an angle 90 deg with the rod. What is the tension, T, in the rope so that the rod is in static equilibrium?
Starting from rest, a 12 cm diameter compact disk takes 2.4 s to reach its operating angular velocity of 1925 rpm. How much torque is applied to the disk
A teaspoon of organic oil dropped on the surface of a stillpond and spreads out to cover the area of almost an acre. what is the size of the single molecule
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