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3 years ago

What decimal is equivalent to 21% ?

Mathematics

2 answers:

makkiz [27]3 years ago

7 0

...it’s 0.21 because 21% is 21/100 which makes it 0.21

zmey [24]3 years ago

5 0

It should be .21 just move the decimal over two times to the left

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What is the solution for 3/2 = 3/2x - 6/5x

Radda [10]

Answer:

x=5

Step-by-step explanation:

3/2 = 3/2x - 6/5x

Get a common denominator of 10 for the fractions with x

3/2 = 3/2 *5/5 x - 6/5 *2/2 x

3/2 = 15/10x - 12/10x

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Multiply each side by 10/3 to isolate x

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3 years ago

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3 years ago

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aalyn [17]

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4 years ago

If a 100 m. diameter wind turbine is exposed to 7 m/s wind with an air density of 1.25 kg/m what is the electricity produced by

Yuliya22 [10]

Answer:

electric energy = 980 J

Step-by-step explanation:

Given,

Diameter of wind turbine = 100 m

Speed of wind,v = 7 m/s

Density of air = 1.25 kg/m

Hence, the total mass of air enters into turbine =Speed of wind x Diameter of wind turbine

= 1.25 x 100

= 125 kg

Hence, total mechanical energy of turbine can be given by,

$E\ =\ \dfrac{1}{2}.m.v^2$

$=\ \dfrac{1}{2}\times 125\times 7^2$

= 3062.5 J

Efficiency of turbine = 32%

Hence,

total electric energy = 32% of mechanical energy

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= 980 J

So, the total electric energy produced by the turbine will be 980 J.

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3 years ago

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7 0

3 years ago