All planets move in an elliptical orbit around the Sun which is at one of the foci. The speed of the planets:?

Question

a. Is always constant
b. Is minimum when closest to the Sun
c. Is maximum when closest to the Sun
d. Changes with the solar activity

Answer 1

Have you ever done "around the world" with a yo-yo? Notice how it goes slower when it's farther away, but goes fast as it spins around your hand? Same thing with the planets, only they're playing "around the sun" and have much less elongated orbits.

Answer 2

The elliptical nature of Earth's orbit is due entirely to the unique stress which tossed it faraway from the image voltaic disc (now the sunlight). If the momentum of this toss were better, the Earth's orbit would have been extra rather elliptical, or it would have been tossed thoroughly out of the image voltaic device continuously. If it were a marginally much less violent toss, Earth's orbit would have been completely around (and it extremely is extremely on the fringe of being around) or if it were even much less violent, it would have spiraled good decrease back into the disc and on no account replace right into a planet in any respect.

Answer 3

C) But ; Since all the planets orbit in ellipses, the orbital speed of the planet will change as it orbit’s the sun. The planet will speed up when it approaches the sun and it will slow down as it moves away from the sun.

Answer 4

c. Is maximum when closest to the Sun
and
e. is equal to sqrt { GM (2/r - 1/a) }