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You want to get an idea of the magnitude of magnetic fields produced by overhead power lines. You estimate that a transmission wire is about 11 m above the ground. The local power company tells you that the line operates a 11 kV and provide a maximum of 48 MW to the local area. Estimate the maximum magnetic field you might experience walking under such a power line, and compare to the Earth's field. [For an ac current, values are rms, and the magnetic field will be changing. Let the Earth's magnetic field strength be 5.0 10-5 T.]
Using a wheel and axle machine, a force of 100 N applied to the rim of a wheel can lift a load of 80 kg .The diameters of the wheel and axle are 1 m and 80 cm respectively. Determine the actual mechanical advantage, and the efficiency of the mac..
q1. two speakers 6.00 m apart are driven by the same audio oscillator so that each one produces a sound consisting of
A golf ball with a coefficient of restitution of 0.78 is tossed horizontally at 0.9 m/s from a height 1.5 m above the level ground. What is the maximum height of the first bounce of the golf ball
An archer, about to shoot an arrow, is applying a force of +320 N to a drawn bowstring. What is the displacement of the bowstring
A swimmer, capable of swimming at a speed of 1.44 m/s in still water (i.e., the swimmer can swim with a speed of 1.44 m/s relative to the water), How long does it take the swimmer to cross the river
Consider a visual binary star system with a period of 55.41 years. Its measured trigonometric parallax is 0.4217'' and, assuming that the plane of the orbit is in the plane of the sky, the true angular extent of the semi-major axis is 6.69''.
An object is in front of a converging lens (f = 0.21 m). The magnification of the lens is m = 4.8. Through what distance should the object be moved
A cafeteria tray dispenser supports a stack of trays on a shelf hangs from four identical spiral springs under tension, one near each corner of the shelf. Each tray is rectangular, 45.3 cm by 35.6cm, 0.450 cm thick, and with mass 580g. Demonstrate..
A 4020 kg roller coaster crests a 24 m high hill with negligible speed. The roller coaster loses 44 kJ of energy on the way down. Determine the speed of the roller coaster
An ac generator has a frequency of 6.5 kHz and a voltage of 40 V. When an inductor is connected between the terminals of this generator, What is the inductance of the inductor
the blades in a blender rotate at a rate of 6600 rpm. when the motor is turned off during operation the blades slow to
A massless pan hangs from a spring that is suspended from the ceiling. What is the pan's distance from the ceiling when the spring reaches its maximum length
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