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When power companies transfer power to you the customer via the high tension lines, they bump up the voltage to several hundred thousand volts. This is done in order to keep energy losses to a minimum. Given that Pin = Pout, and that P = IV (power = current x voltage), how does raising V lessen the loss of energy as it travels to the customer?
A dragster starts from rest and accelerates down a track. Each tire has a radius of 0.320 m and rolls without slipping. At a distance of 401 m, estimate the linear speed of the dragster
a thin 20-kg, 5.0 m long rod is bent into a semi circle. A 0.10 kg object is placed at the center of the curvature of the semi circle. WHat is the gravitational force of the rod on the object
If the force on the ball increases linearly for 4.00 ms, holds constant for 20.0 ms, and then decreases linearly to zero in another 4.00 ms, what is the maximum force on the ball
A person exerts a horizontal force of F = 179N in the test apparatus shown in the drawing. (h = 0.33 m.) Determine the horizontal force M that his flexor muscle exerts on his forearm.
a point charge of -7.0 u c is at the origin.part a what is the electric potential at 3.0 m 0? express your answer
One gram of water changes from liquid to solid at a constantpressure of 1.00 atm and a constant temperature of 0°C. Find the change in the internal energy of the water
Each of the two identical springs in the figure below has force constant k = 1.22 x 103 N/m, d = 1.16 m, and θ¸ = 30.5o. Find the unstretched length of each spring.
A mirror at an amusement park shows an upright image of any person who stands 1.4 m in front of it. what is the radius of curvature
A 70 kilogram person is walking up a 15 % grade hill. Plot the fuel consumption of the person in watts vs. speed from 1 to 7 kilometers per hour in steps of 1. Where does the lost energy go
A spider has a mass of 0.70-g and is hanging from rest on a 20-cm long thread of 0.0020-mm diameter of silk, If the string is whirled in a circle at a rate of 2 revolutions per second, what is the minimum and maximum time for vibrational information..
Light from the sun arrives at the earth at the rate of about 1400 W/m^2 of area perpendicular to the direction of the light. find the number of photons per second that fall on each square meter of the earth's surface directly facing the sun
Imagine that you swing about your head a ball attached to theend of a string. The ball moves at a constant speed in a horizontal circle. What centripetal force are you imparting to the ball via the string
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