What is the motion of the earth around the sun? What is its cycle? What is its average distance from the sun

It can be regarded as circular motion
But it's not very round and it's not uniform
The cycle is 365 days a year
The average distance is 149.6 million km

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1. It is known that the mass of the sun is 1.97 * 10 ^ 30kg, the mass of the earth is 6.68 * 10 ^ 24kg, and the average distance between the sun and the earth is 1.49 * 10 ^ 11m The gravitational force between the sun and the earth is_____ N. It is known that the tensile force of 5.98 * 10 ^ 24N is needed for a steel bar with a cross-sectional area of 1cm, so what is the cross-sectional area that can be pulled by the gravitational force between the earth and the sun_____ M ^ 2 Please write down the analysis process,
2. It is known that the mass of the earth is 6 × 10 ^ 24kg, the mass of the sun is 2.0 × 10 ^ 30kg, and the orbit radius of the earth around the sun is 1.5 × 10 ^ 11m (1) The gravity of the sun on the earth (2) The centripetal acceleration of the earth around the sun
3. The height of both students is about 1.6 × 102 cm, but a says he is 9 cm higher than B. is it possible? If possible, please give examples; if not, please give reasons
4. Xiao Ming and Xiao Liang are both about 1.6 times 10 of 2 cm square. Can Xiao Ming be 9cm higher than Xiao Liang
5. 1. If two of the univariate quadratic equations 2x ^ 2-mx + 4 = 0 are x1, X2 and satisfy x2 / X1 + X1 / x2 = 2, the value of M is 2. Let X1 and X2 be the two roots of the equation x ^ 2-x-1 = 0. （1）x1^2x2+x1x2^2 (2)(x1-x2)^2 (3)(x1+1/x2)(x2+1/x1)
6. High school mathematics problem: the equation about X: the square of X - 2mx + the square of 2m - 1 = 0, have at least one negative root, find the value range of M Hurry!
7. If M and N are integers and (MX + a) (x-3a) = 3x ^ 2 + nax-3a ^ 2, find the value of M and n
8. Given that the fourth power of - M + the second power of 4m + the nth power of 2, the second power of M + the nth power of 2 + 5 = 0, and m and N are positive integers, find the value of M and N? There are points. Come and get them!
9. It is known that: m power of 2 = a, n power of 2 = B (m, n are positive integers), then m power + n power of 2 = what
10. When n is a positive integer, is the value of square + N + 11 of N necessarily prime?
11. How many times the mass of the sun is that of the earth? this is it!
12. The speed of the earth around the sun is about 11000km / h, and the speed of sound in the air is about 340m / s
13. 9. Macro objects are made up of a large number of molecules, which are about the order of magnitude in diameter_____ m.
14. How many nanometers is the diameter of the molecule?
15. A what does a full stop mean? It should be an order of magnitude in physics, but I don't know how much
16. How many times the mass of the sun is that of the earth?
17. The mass of the sun is about several times that of the earth It's urgent!
18. For a man-made earth satellite with mass m moving in a circular orbit, the distance from the ground is equal to the radius of the earth R, and the mass of the earth is m? (2) What is the period of satellite motion?
19. For a man-made earth satellite with mass m in circular orbit, its distance to the ground is equal to the radius r of the earth, and the acceleration of gravity on the ground is g, Then () A. The linear velocity is root 2rg B. The period is 4 π times the root sign 2R / g C. The acceleration is 1 / 2 times G D. The angular velocity is 1 / 2 times the root sign g / 2R
20. The period of a man-made earth satellite orbiting the earth in a circular orbit may be () A. 60 minutes B, 80 minutes C. 180 minutes D, 25 hours Shouldn't it be more than 24 hours? I chose D, the answer is CD, why