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A step-down transformer (turns ratio = 1:6) is used with an electric train to reduce the voltage from the wall receptacle to a value needed to operate the train. When the train is running, the current in the secondary coil is 4.50 A. What is the current in the primary coil?
A neutron star is the remnant left after certain supernovae (explosions of giant stars). Typically, neutron stars are about 20 in diameter and have around the same mass as our sun. What is a typical neutron star density in g/cm^3?
A man drags a 72.0 kg crate across the floor at a constant velocity by pulling on a strap attached to the bottom of the crate. The crate is tilted 26 degrees above the horizontal, and the strap is inclined 68 degrees above the horizontal. The center ..
Two identical cars, one stationary and the other driving toward the stationary one at 45 m/s, what is the beat frequency each driver hears
What is the flow speed of the medicine through the needle. What is the least force the nurse needs to apply to the syringe.
A diver springs upward from a board that is three meters above the water. Determine her initial velocity, both magnitude and direction
Someone puts an upright 0.450 m radius wreath made out of 30 windings of a string of lights, What is the induced current in the wreath from a N-S wire with a steady DC of 4.00 A2.00 m below the wreath
A 7kg squirrel walks to the end of a 15 kg board resting on two saw horses. When the squirrel is at the 1m position away from the right end of board, How long is the board
A step-down transformer is used for recharging the batteries of portable devices. Find the power delivered to the CD player
A planet orbits the sun with a period of 14 years? How far is the planet from the sun
A child's water pistol shoots water through a 1.0mm -diameter hole. What is the volume flow rate during the squirt
A uniform plank of length 4.00 m and weight 350 N rests horizontally on two supports, with 1.00 m of the plank hanging over the right support. What is the maximum value of the distance x before the plank begins to tip
A solenoid of length 4.0 cm and diameter 0.93 cm is wound with 165 turns per cm. What is the induced emf in one of the windings
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