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Someone puts an upright 0.450 m radius wreath made out of 30 windings of a string of lights (wire with some resistance) on the roof of a 30.0 m long barn. The length of the barn is from north to south and the wreath faces west and is located midway between the north side and south side of the barn. Lightning strikes the south side of the barn. For one stroke of lightning assume the current went from 0 to30, 000A in70 mu s. What is the EMF induced in the wreath? If the wreath has a total resistance of 5.00 Ohm what current will be induced in the wreath and what direction will the current be in? What induced current would there be and in what direction if the lightning struck the north side of the barn? 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 (inside the barn).
A dam is used to block the passage of a river and to generate electricity. Approximately 5.73 x 10^4 kg of water fall each second through a height of 19.6 m. I one half of the gravitational potential energy of water were converted to electrical energ..
Two insulated wires, each 2.94 m long, are taped together to form a two-wire unit that is 2.94 m long. One wire carries a current of 8.36 A, What is the current I
An AA battery is connected to a parallel-plate capacitor having 4 diameter plates spaced 3 apart. How much charge does the battery move from one plate to the other.
A person who weighs 680 N is riding a 98-N mountain bike. Suppose the entire weight of the rider and bike is supported equally by the two tires. If the gauge pressure in each tire is 6.45 105 Pa, what is the area of contact between each tire and the ..
How long can craft hover over the moon surface Contract between Einstein's calculations and observed precession
A sphere of radius R has a charge Q. The electric field strength at a distance r > R is Ei. What is the ratio Ef/Ei of the final to first electric field strength if Q is halved.
When she tightens the string slightly, she hears 6 beats/s. What is the frequency of string now.
A 7.5cm diameter circular loop of wire is in a 0.76T magnetic field. The loop is removed from the field in 0.21s, What is the average induced emf
An electric car accelerates for 8.0 s by drawing energy from its 345-V battery pack. During this time, Find the minimum horsepower rating of the car
A defibrillator consists of a 16.7-µF capacitor that is charged to 9.0 kV. (a) If the capacitor is discharged in 2.0 ms, how much charge passes through the body tissues? C (b) What is the average power delivered to the tissues?
An electron is accelerated from rest through a uniform electric field of 4000 V/m. How much is the change of potential energy of this electron
On earth, two parts of a space probe weigh 14000 N and 3500 N. These parts are separated by the center-to-center distance of 8m and may be treated as uniform spherical objects. Find out the magnitude of the gravitational force that each part exerts o..
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