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A generator at Hoover Dam can supply 396 MW of electrical power. Assume that the turbine and the generator are 83.1% effi- cient. Find the rate with which falling water must supply energy to the turbine. The accelera- tion due to gravity is 9.8 m/s2 . Answer 476.53 Part 2 If the water falls 21.3 m, what is the mass of the water that must pass through the turbine each second to supply this power? Answer in units of kg/s
a man is standing near a gate and a flag pole. The gate is 15 ft from the pole. If the pole is h=35 ft tall, how far is the man from the gate
The charging circuit for the flash system of a camera uses a 130 muF capacitor that is charged from a 250V power supply. What is the most resistance that can be in series with the capacitor if the capacitor is to charge to at least 86% of its final..
Find the radius of the largest water drop
Two charges of equal magnitude exert an attractive force of 7.5×10-4 N on each other. If the magnitude of each charge is +2.4? C, how far apart are the charges
A long thin solenoid has 55 turns/cm and carries a current of 0.212 A. The solenoid is filled with iron and the magnetic field is measured to be 1.49 T.
A balloon is filled with helium at a pressure of 1.0 105 Pa.The balloon is at a temperature of 23°C and has a radius of0.18 m. How many helium atoms are contained in the balloon
A 78.0 ohm and a 48.0 ohm resistor are connected in parallel. When this combination is connected across a battery, the current delivered by the battery is 0.275 A.
A decade before Einstein published his theory of relativity, J.J. Thomson proposed that the electron might consist of small parts, Find the total electric potential energy of this arrangement
A proton and an alpha particle (q = +2e, m = 4 u) are fired directly toward each other from far away, each with an initial speed of 0.012c. What is their distance of closest approach
A science-fair radio uses a homemade capacitor made of two 45 cm by 45 cm sheets of aluminum foil separated by a 0.30-mm-thick sheet of paper, What is its capacitance
A single force acts on a 4.4 kg particle-like object in such a way that the position of the object as a function of time is given by x = 3.8t - 4.6t2 + 1.3t3
A hockey puck impacts a goalie's plastic mask horizontally at 118 mph and rebounds horizontally off the mask at 50mph. with what speed will the goalie move
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