Does the earth rotate and undergo revolution with the same speed?

  • Thread starter monty37
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  • #1
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does the earth rotate and undergo revolution with the same speed?is the rotation
and revolution in same direction
 

Answers and Replies

  • #2
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From your question, I will understand "rotate" as the Earth spinning on an axes, and "revolution" as the Earth going around the Sun.

In this way, no the Earth does rotate at the same speed as it turns around the Sun. Firstly, because the rotation speed is not the same everywhere on our planet. You will travel at a much higher speed if you are next to the equator, and you will be pratically standing (spinning on yourself) at the poles. Seconldy, even taking the highest rotation spped of our planet (around the equator), you would travel at [tex]1670\frac{km}{h}[/tex] compared to the center. This means that if our planet would stop rotating, the people at the equator would hit the east wall at [tex]1670\frac{km}{h}[/tex].

On the other hand, the Earth is going around the Sun at [tex]1.076 \times 10^{5} \frac{km}{h}[/tex].

Cheers
 
  • #3
negitron
Science Advisor
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You know the Earth's diameter is about 7400 miles and rotates once in 24 hours. You also know the Earth's orbit averages about 93,000,000 miles and completes once every 365 days.

Do the math and you tell me.
 
  • #4
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but it is the angular velocity that has to be taken,as earth undergoes rotatory motion.
 
  • #5
Hootenanny
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but it is the angular velocity that has to be taken,as earth undergoes rotatory motion.
Yes, what it your point?

fatra2 takes into account the angular velocity of earth and negitron gives you all the information you need to compute it.
 
  • #6
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if angular velocity had been taken into account,then the velocity should
have been in radians/sec.

so the angular distance required to calculate this would be the elliptical path
divided by time(365x 24x3600)?right

so this would this be the velocity of earth to aperson in space?
 
  • #7
negitron
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if angular velocity had been taken into account,then the velocity should
have been in radians/sec.
The figures in my post are given as angular velocity, albeit somehwat indirectly.
 
  • #8
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may i know in what indirect way,is it in terms of v=rw,i mean has the radius been
multiplied with ang velocity and given as linear velocity?
 
  • #9
negitron
Science Advisor
842
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What does it mean when I tell you, for example, that the Earth has a diameter of 7400 miles and it makes one revolution in 24 hours? Can't you relate that to an angular velocity with simple arithmetic?
 

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