3 years ago

The Red Sea is widening at a rate of 1.25 centimeters per year. How many years will it take to widen another 812.5 centimeters?

Physics

1 answer:

Pani-rosa [81]3 years ago

5 0

E 812 Jak’s now fmfdkc

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V125BC [204]

at the top most point if Rupert will not fall then normal force at the top point is almost zero for minimum speed

so here we can say

$F_n + mg = m\frac{v^2}{R}$

now if

$F_n = 0$

$mg = \frac{mv^2}{R}$

$v = \sqrt{Rg}$

$v = \sqrt{25 \times 9.8}$

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so above will be the minimum speed

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3 years ago

Which property of sound waves decreases as the square of the distance from the source increases?

Vitek1552 [10]

Answer:

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Explanation:

The intensity of a sound wave is equal to the ratio between to the power emitted by the source divided by the area of the spherical surface through which the wave propagates:

$I=\frac{P}{4\pi r^2}$

where

P is the power

$4\pi r^2$ is the area of the spherical surface

r is the distance from the source

As we see from the formula, the intensity is inversely proportional to the square of the distance from the source:

$I\propto \frac{1}{r^2}$

so, intensity is the correct answer.

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ludmilkaskok [199]

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Explanation:

did i help? NO ok.

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