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Tju [1.3M]
2 years ago
15

Convert 3.2 kilometers to feet? ​

Physics
2 answers:
Tanzania [10]2 years ago
7 0

Answer:

10498.7 feet

Explanation:

Lelechka [254]2 years ago
7 0

Answer: 10498.6877 Feet

Answer when rounded: 10498.688

Explanation:

1 Kilometer = 3280.84 Feet

3.2 • 3280.84 = 10498.6877

Hope this helps!

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Modern wind turbines generate electricity from wind power. The large, massive blades have a large moment of inertia and carry a
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Answer:

Explanation:

a )

Each blade is in the form of rod with axis near one end of the rod

Moment of inertia of one blade

= 1/3 x m l²

where m is mass of the blade

l is length of each blade.

Total moment of moment of 3 blades

= 3 x\frac{1}{3}  x m l²

ml²

2 )

Given

m = 5500 kg

l = 45 m

Putting these values we get

moment of inertia of one blade

= 1/3 x 5500 x 45 x 45

= 37.125 x 10⁵ kg.m²

Moment of inertia of 3 blades

= 3 x 37.125 x 10⁵ kg.m²

= 111 .375 x 10⁵ kg.m²

c )

Angular momentum

= I x ω

I is moment of inertia of turbine

ω is angular velocity

ω = 2π f

f is frequency of rotation of blade

d )

I = 111 .375 x 10⁵ kg.m² ( Calculated )

f = 11 rpm ( revolution per minute )

= 11 / 60 revolution per second

ω = 2π f

=  2π  x  11 / 60 rad / s

Angular momentum

= I x ω

111 .375 x 10⁵ kg.m² x  2π  x  11 / 60 rad / s

= 128.23 x 10⁵  kgm² s⁻¹ .

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Which of the following causes current to flow in a wire?
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