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Many hydroelectric systems utilise a backup reservoir in times of high demand. Filling a back up reservior requires more energy than can be obtained from its use. Calculate the power required (in MW) to pump water into a backup reservoir 25 metres above the water level, if the pumps operate at a flow rate of 15,000 litres per second and the pipe friction reduces the efficiency of pumping by 18%. (g=9.81 m.s-2 and the density of water is 1000 kg.m-3)
Develop a point estimate of the mean value of y when x1 = 180 and x2 = 310 (to 3 decimals).
Compute and interpret the meaning of the instaneous rate of change at t=11
find the volume of the solid lying under the elliptic paraboloid x^2/4+y^2/9+z=1 and above the rectangle R = [-1,1]x[-2,2]
Please show the how to solve the following. Please offer as much explanation as possible. Graph a function on the interval [-2,5] having the following characteristics:
Manufacturer of mp3 players is preparing to set the price on a new model and demand is thought to depend on the price and is represented by the model
A surveyor fins that a tree on the opposite bank of a river, flowing due east, has a bearing of N 22 degrees 30' E from a certain point and a bearing of N 15 degrees W from a point 400 feet downstream. Find the width of the river.
How to find some useful materials for undergraduate
A fitness ball id delivered in a flat package with a hand pump. The pump inflates the ball at 280cmcubed per pump, to a diameter of 28cm. How many pumps are needed to inflate the ball? Explain how you got your answer.
explain the difference between the results in part a and part b.
find the probability that his or her birthday is not in May. If a person is randomly selected, find the probability that his or her birthday is not in May.
Megan earns $20 an hour plus a $100 daily bonus. She uses a function to calculate her daily earnings. What is the inverse function of Megan's daily earnings function?
A 2 mile cab ride costs $1.70. A 7 mile cab ride cost $3.70. Find a linear equation that models cost as a function of distance.
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