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How can u say that the Earth does not move around the Sun with uniform velocity.
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Answers
it should be known that all planets are sun-centric, i.e. they move around sun in various elliptical orbits with sun at one of the foci. Therefore, every planet, including earth have two velocities :
Angular or orbital velocity (in radian per sec), and
Linear velocity at any position (in km per sec).
The angular velocity is governed by Kepler’s second law (equal area-equal time). Combining this with principle of conservation of angular momentum, we get angular velocity
Since r changes from point to point on the orbital path, angular velocity is not constant or uniform. accordingly, the linear velocity is maximum at the point nearest to sun (shortest r or perihelion) and minimum at the point farthest from sun (longest r or aphelion). Therefore, earth’s motion around sun can never have a uniform velocity (linear or angular).
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Answer:
Since the earth moves around the sun in elliptical orbit with constant areal velocity therefore speed of the earth is maximum when the earth is closest to the sun and vice-versa. Velocity of the earth can never be uniform as speed and the instantaneous direction of motion keep on changing.
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