3 years ago

Gravitational pull is determined by ______?

Physics

1 answer:

IgorLugansk [536]3 years ago

6 0

The answer is D. mass

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3 years ago

A vacuum cleaner produces sound with a measured sound level of 75.0 dB. (a) What is the intensity of this sound in W/m2? W/m2 (b

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Answer:

Part a)

$I = 3.16 \times 10^{-5} W/m^2$

Part b)

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Explanation:

Part a)

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

here we know that

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now we have

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

$I = 3.16 \times 10^{-5} W/m^2$

Part b)

Intensity of sound wave is given as

$I = \frac{1}{2}\rho A^2\omega^2 c$

here we know that

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

so we have

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

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

now we know

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$c = 340 m/s$

$B = 1.4 \times 10^5 Pa$

now we have

$3.16 \times 10^{-5} = \frac{1}{2}(1.2)P_o^2\frac{340^3}{(1.4\times 10^5)^2}$

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3 years ago

A ray of light bends upon entering a new medium. What is this phenomenon called?

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