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2 years ago

I hope everyone is ok rn with this tornado . prayers if anyone hurt

Physics

2 answers:

skad [1K]2 years ago

4 0

<h2><em>THERE WAS A TORNADO????????????</em></h2><h2><em></em></h2><h2><em>SAY WHAT?!</em></h2>

Marina86 [1]2 years ago

3 0

I hope everyone that everyone that is in the tornado stays safe. My prayers go out to them! have a nice day.

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What creates the changes in step 1,2,3 of the nitrogen cycle

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2 years ago

A boy walked 4m east then 3m south find the displacement

Solnce55 [7]

Answer:

Explanation:

$4^{2}+3^{2}=5^{2}\\5^{2}=25$

Use the Pythagorean theorem to calculate the long edge of the triangle, which would be his displacement.

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2 years ago

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2 years ago

Which uses motion of water in nature to produce electricity?

Zinaida [17]

Answer: D. Hydroelectric power

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3 years ago

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

$10000 = 0.5 * 1.2 * 8.89^3 * A * 0.45$

$10000 = 190A$

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

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

$\pi r^2 = A = 52.7$

$r^2 = 52.7 / \pi = 16.79$

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

4 0

2 years ago