This is an excel question Some alternative energy technologies, such as wind and
ID: 1572547 • Letter: T
Question
This is an excel question Some alternative energy technologies, such as wind and solar, produce more energy than needed during peak production times, but produce insufficient energy at other times Many schemes have been concocted to store the surplus energy generated during peak times for later use when generation decreases One scheme is to use the energy to spin a massive flywheel at very high speeds, then use the rotational kinetic energy stored to power an electric generator later. Set up an Excel worksheet to calculate how much energy is stored in flywheels of various sizes. The speed of the flywheel, in revolutions per minute, is to be entered in cell B2, and the density of the flywheel maternal in cell B4 In cell B3 convert the speed in revolutions per minute to radians per second, recall there are 2n radians per revolution of the wheel. To simplify the calculations, separate it into 3 steps and use the format in Table 1 as an outline for each of the three steps. Calculate the volume of each of the flywheels in m1 (cubic meters) Use the first table to calculate the mass of each flywheel in kg (kilograms) Use the second table to calculate the rotational kinetic energy using. Where m is the mass and r is the radius of the flywheel, omega is the rotational speed in rad/sec. Highlight the cell that has the maximum kinetic energy in Green. Highlight the cell that has the minimum kinetic energy in Red.Explanation / Answer
volume of each flywheel = pi * r2 * h
= 3.14 * 0.12 * 0.5
= 0.0157 m3
mass of each fly wheel = 0.0157 * 1500
= 23.55 kg
rotational kinetic energy = 1/4 * 23.55 * 0.12 * 152
= 13.24 J
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