3 years ago

If we know the total energy in a system is 30 J, and we know the PE is 20 J. What is the KE?

Physics

1 answer:

svetoff [14.1K]3 years ago

3 0

Can you give more description ??

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3 years ago

By what factor must the amplitude of a sound wave be increased in order to increase the intensity by a factor of 9?a. 9 b. 2 c.

Marta_Voda [28]

Answer:

option D

Explanation:

given,

$intensity\ \alpha \ (Amplitude)^2$

increase the intensity by factor of 9

I₁ = I₀

I₂ = 9 I₀

now,

$\dfrac{I_1}{I_2}=\dfrac{A_1^2}{A_2^2}$

$\dfrac{I_0}{9I_0}=(\dfrac{A_1}{A_2})^2$

$(\dfrac{A_1}{A_2})^2=\dfrac{1}{9}$

$\dfrac{A_1}{A_2}=\dfrac{1}{3}$

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hence, amplitude increase with the factor of 3

so, the correct answer is option D

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Answer:

1.332 N

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Net Force = Mass x Acceleration
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