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The maximum strength of the earth's magnetic field is about 6.9 x 10-5 T near the south magnetic pole. Suppose we want to utilize this field with a rotating coil to generate 48.8-Hz ac electricity. What is the minimum number of turns (area per turn = 0.021 m2) that the coil must have to produce an rms voltage of 170 V?
A converging lens has a focal lenght of 20cm. determine Where is the image located
A uniform meter stick is freely pivoted about the 0.20-m mark. If it is allowed to swing in a vertical plane with a small amplitude and friction, what is the frequency of its oscillations
A 116 g Frisbee is 28 cm in diameter and has about half its mass spread uniformly in a disk, and the other half concentrated in the rim. What is the magnitude of the torque, assumed constant, that the student applies
find out the magnitude of their acceleration. If the blocks move determine the magnitude of the tension in the string. If the blocks do not move determine the sum of magnitude of the forces of friction acting on the blocks. Show all the work.
A lens for a 35-mm camera has a focal length given by f = 40mm. What is the magnification of the image on the film
A 3.5 m long, 310 kg steel beam extends horizontally from the point where it has been bolted to the framework of a new building under construction. A 70 kg construction worker stands at the far end of the beam.
A ranger in a national park is driving at 41km/h when a deer jumps onto the road 66 m ahead of the vehicle. After a reaction time of t s, ranger applies the brakes to produce an acceleration of -3.20m/s2. What is the maximum reaction time allowed ..
A cat runs along a straight line (the x-axis) from point A to point B to point C. The distance between points A and C is 5.00 m, distance between points B and C is 10.0 m, and the positive direction of x axis points to the right. The time to run f..
hanging mass has a mass, m = 19g, the wheel has a radius, R = 0.10m, and the wheel and axle has a moment of inertia, find the acceleration of the hanging mass
A ball with mass m = 0.170 kg and kinetic energy K1 = 2.17 J collides elastically with a second ball of thesame mass that is initially at rest. find the kinetic energy of the first ball after the collision
Clarisse invests $61500 in money-market accounts at three different banks. Bank A pays 2% interest per year, bank B pays 2.5%, How much did she invest in each bank
A simple pendulum, 2m in length, is released from the rest when the support string is at an angle of 25 degrees from the vertical
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