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It's hard to believe that residential and commercial electric power has only been around for the last 120 years. Many of our grandparents were alive when the notion of electric powered lights was novel. The advent of widespread electric power was not without controversy. An epic technical battle was waged between two giants of the era, Thomas Edison and George Westinghouse. Edison was a proponent of DC electricity while Westinghouse favored an alternating current approach. Discuss the technological arguments that were brought forward by Edison and Westinghouse. Bring physical detail to your posts.
Suppose a 61 kg boy and a 43 kg girl use a mass less rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
A cylindrical shell of length 220 m and radius 7 cm carries a uniform surface charge density of 13 nC/m2. Find the electric field at the ends of the following radial distances from the long axis of the cylinder
A flashlight bulb with a resistance of 40 ohm is powered with a six volt battery and produces .75W power. obtain the internal resistance of the battery
A constant horizontal force F of magnitude 20 N is applied to awheel of mass 20 kg and radius 0.5 m. The wheel rolls withoutslipping on the horizontal surface, and the acceleration of its center of mass has magnitude 0.5 m/s^2.
A capacitance of is connected to an alternating emf of frequency 100 cycles/second. What is the capacitive reactance
A concave mirror produces a virtual image that is three times as tall as the object. what is the radius of curvature of this mirror
a 270-kg object and a 570-kg object are separated by 4.40 m.a find the magnitude of the net gravitational force exerted
An experimental plane just after takeoff climbs with a speed of 500km\h at an angle of 37o with the horizontal. Find at what rate is the plane gaining altitude
how would you expect the voltage across a battery to compare to the voltage across the bulb with the switch open and
Light in a vacuum is incident on a transparent glass slab. The angle of incidence is 38.8°. What is the index of refraction of the liquid
An antiaircraft shell is fired vertically upward with an initial velocity of 200m/s. compute the maximum height of the shell
A galvanonmeter has an internal resistance of 100 Ω and deflects full-scale at 2.00 mA. what size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV?
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