3 years ago

Do not have definite size and always take the shape of their contanier

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1 answer:

sladkih [1.3K]3 years ago

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Answer:

water or h2o

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This problem follows up on a discussion from lecture. A wind turbine with an efficiency of 45% for converting wind energy into e

Volgvan

Answer:

4.1 m

Explanation:

10 kW = 10000 W

20mi/h = 20*1.6 km/mi = 32 km/h = 32 * 1000 (m/km) *(1/3600) hr/s = 8.89 m/s

The power yielded by the wind turbine can be calculated using the following formula

$P = \frac{1}{2} \rho v^3 A C_p$

where $\rho = 1.2 kg/m^3$ is the air density, v = 8.89 m/s is the wind speed, A is the swept area and $C_p = 0.45$ is the efficiency

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$A = 10000 / 190 = 52.7 m^2$

The swept area is a circle with radius r being the blade length

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$r = \sqrt{16.79} = 4.1 m$

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3 years ago