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

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

(1) The gravity of the sun on the earth is f = GMM / R ^ 2 = 6.67 * 10 ^ - 11 * 2.0 * 10 ^ 30 * 6 * 10 ^ 24 / (1.5 * 10 ^ 11) ^ 2 = 3.56 * 10 ^ 22n (2) the centripetal acceleration of the earth around the sun is a = GM / R ^ 2 = 6.67 * 10 ^ - 11 * 2 * 10 ^ 30 / (1.5 * 10 ^ 11) ^ 2 = 5.93 * 10 ^ - 3 M / S ^ 2

It is known that the mass of the earth is 5.89 * 10 ^ 24kg, the mass of the sun is 2.0 * 10 ^ 30kg, and the radius of the earth's orbit around the sun is 1.5 * 10 ^ 11m
The centripetal acceleration of the earth around the sun

F = GMM / R ^ 2 - in duplicate
F = ma -- two forms
From this, we can see that the mass of the satellite (the earth) does not affect the centripetal acceleration. G can be found in the textbook or the beginning of the volume. It should have been given, g = 6.67 * 10 ^ - 11, and the unit is (n * m ^ 2 / kg ^ - 2)!

The height of a and B students is 1.7 × 10 cm, but a says that they are 9cm higher than B. is it possible? If so, can you give an example?

It's possible, in the case of rounding and retaining two significant digits. For example, 1.65 * 10 square and 1.74 * 10 square are both 1.7 * 10 square. But the difference between the two numbers is 9cm, OK?