Earth's centripetal force is the force that keeps the planet in orbit around the sun. It is a result of the gravitational pull between the Earth and the sun.
The formula for calculating Earth's centripetal force is F = (mv^2)/r, where F is the force, m is the mass of the Earth, v is the velocity of the Earth in its orbit, and r is the distance between the Earth and the sun.
If Earth's centripetal force suddenly disappeared, the planet would no longer be able to maintain its orbit and would fly off into space in a straight line. This would result in catastrophic consequences for life on Earth.
The centripetal force of the Earth affects the length of a day by causing the planet to bulge slightly at the equator. This bulge causes the Earth to spin slightly faster, resulting in a shorter day at the equator compared to the poles.
Yes, Earth's centripetal force can change over time due to various factors like changes in the Earth's mass, changes in its distance from the sun, and gravitational pull from other celestial bodies. However, these changes are very small and do not significantly affect the Earth's orbit around the sun.