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harkovskaia [24]
4 years ago
11

Find the area of a circle with a radius r of 6 feet. Round off your answer to one decimal point. Hint: the formula for the area

of a circle is A = π r2 and π should be approximated to four decimal places. 

Physics
2 answers:
mars1129 [50]4 years ago
7 0
Hope it will help you!

Law Incorporation [45]4 years ago
3 0
If you plug in pi then round, you get 113.1 ft^2 as the area. If you use 3.1415 as pi then round, you also get 113.1 ft^2 as the area. Hope this helps!
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3 years ago
If I wanted to generate a maximum emf of 20 V, what angular velocity (radians/sec, aka Hz) would be required given a circular co
MissTica

Answer:

35.36776 Hz

Explanation:

B = Magnetic field = 9\times 10^{-3}}\ T

E_m = Maximum voltage = 20 V

d = Diameter of coil = 40 cm = 0.4 m

A = Area = \pi \frac{d}{2}^2=\pi 0.2^2

N = Number of turns = 500

\omega = Angular velocity

Maximum emf is given by

E_m=NAB\omega\\\Rightarrow \omega=\frac{E_m}{NAB}\\\Rightarrow \omega=\frac{20}{500\times \pi\times 0.2^2\times 9\times 10^{-3}}\\\Rightarrow \omega=35.36776\ Hz

The angular velocity would be 35.36776 Hz

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4 years ago
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