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2 years ago

6

A box of unknown weight is 1 m away from the fulcrum. To balance the sides, a student applies a force of 4 N at a distance of 3

m away from the fulcrum. How much force is the box exerting on the balance beam? In other words, what is the weight of the box?
This is due by 4:10

1 answer:

Solnce55 [7]2 years ago

3 0

Answer: I think A

Explanation:

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Part a)

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Part b)

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Explanation:

Part a)

Level of sound = 75 dB

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$L = 10 Log\frac{I}{I_0}$

here we know that

$I_0 = 10^{-12} W/m^2$

now we have

$75 = 10 Log(\frac{I}{10^{-12}})$

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Part b)

Intensity of sound wave is given as

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here we know that

$A = \frac{P_o}{Bk}$

so we have

$I = \frac{1}{2}\rho(\frac{P_o}{Bk})^2\omega^2 c$

$I = \frac{1}{2}\rho P_o^2 \frac{c^3}{B^2}$

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$B = 1.4 \times 10^5 Pa$

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