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4 years ago

What is the average density of the Earth?

Physics

1 answer:

Mekhanik [1.2K]4 years ago

6 0

Answer:

5.513 grams per cubic centimeter

Explanation:

To get the exactly process for the calculation of the density of the earth is quite complex because earth is not quite a sphere. The planet's rotation causes it to bulge at the equator. Earth polar radius is 6,356 km and for the calculation of the mass we should have in count the metallic core inside the planet, more information can be read it in the following web site.

https://www.space.com/17638-how-big-is-earth.html#:~:targetText=Earth's%20mass%20is%206.6%20sextillion,and%2029%20percent%20by%20land.

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All points ate true

But option A is perfect

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A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with

beks73 [17]

Answer:

4.6 kHz

Explanation:

The formula for the Doppler effect allows us to find the frequency of the reflected wave:

$f'=(\frac{v}{v-v_s})f$

where

f is the original frequency of the sound

v is the speed of sound

vs is the speed of the wave source

In this problem, we have

f = 41.2 kHz

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vs = 33.0 m/s

Therefore, if we substitute in the equation we find the frequency of the reflected wave:

$f'=(\frac{330 m/s}{330 m/s-33.0 m/s})(41.2 kHz)=45.8 kHz$

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3 years ago

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At what position in its elliptical orbit is the speed of a planet a maximum? when it is closest to the sun when it is farthest f

Phantasy [73]

Answer:

1.when it is closest to the sun

2.when it is midway between its farthest

Explanation:

According to the law of Kepler's

T ² ∝ r³

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$v=\dfrac{2\pi r}{T}$

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$v^2\alpha \dfrac{1}{r}$

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So we can say that ,when r is more then the speed will be minimum and when r is low then speed will be maximum.

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3 years ago

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hjlf

Periodic motion implies that the ride oscillates back and forth. The period is the time it takes to complete one cycle. Therefore it would be the swing.

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3 years ago