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3 years ago

A cinder block is sitting on a platform 10 m high. It has a mass of 25 Kg. What is the potential energy

Physics

1 answer:

mash [69]3 years ago

8 0

Answer:

2450J

Explanation:

PE = mgh

PE = (25)(9.8)(10)

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tresset_1 [31]

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2 years ago

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3 years ago

Question 7 (1 point)

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Answer:

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2 years ago

By what factor must the amplitude of a sound wave be decreased in order to decrease the intensity by a factor of 3?

s344n2d4d5 [400]

Answer:

Amplitude is decreased by a factor of $\sqrt3$ if intensity is decreased by a factor of 3.

Explanation:

Intensity of a sound wave is directly proportional to the square of its amplitude.

Therefore, if intensity is $I$ and amplitude is $A$ , then

$I=kA^2$ , where, $k$ is constant of proportionality.

Now, if intensity of sound wave is decreased by a factor of 3. So,

New intensity is, $I_{new}=\frac{I}{3}$

$I_{new}=kA_{new}^2\\\frac{I}{3}=kA_{new}^2$

Plug in $kA^2$ for $I$ . This gives,

$\frac{kA^2}{3}=kA_{new}^2\\A_{new}^2=\frac{A^2}{3}\\A_{new}=\sqrt{\frac{A^2}{3}}=\frac{A}{\sqrt{3}}$

Therefore, amplitude is decreased by a factor of $\sqrt3$ .

4 0

3 years ago

Convert 325 cm to yards I need the answer ASAP

Ira Lisetskai [31]

325 /91 = 3.571 yards

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3 years ago