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The radius of the earth's orbit around the sun (assumed to be circular) is 1.50×108km, and...

The radius of the earth's orbit around the sun (assumed to be circular) is 1.50×108km, and the earth travels around this orbit in 365 days.

1- What is the magnitude of the orbital velocity of the earth in m/s?

2- What is the radial acceleration of the earth toward the sun?

3- What is the magnitude of the orbital velocity of the planet Mercury (orbit radius =5.79×107km, orbital period = 88.0 days)?

4- What is the radial acceleration of the Mercury?

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