Estimate Mass of Sun Using G, Distance and Speed

[lemon]

1. The distance between the Sun and Earth is 1.5x10^11m and the Earth's orbital speed is 30km/s. Use this information and the value of G to estimate the mass of the Sun

could somebody check this for me please. thank you

2. G=6.67x10^-11Nm^2kg^-2

 

[rock.freak667]

Your working is correct, you numerical result is wrong. Your final answer should be in the order of 10³⁰

 

[lemon]

it is too.
It should be 2.0x10^30(1s.f.)?

 

[D H]

That is the answer you should get. Now look at your expression, and see if you really did calculate what you wrote down. (Hint: you didn't.)

 

[lemon]

I blame the calculator. Who's with me?

thanks everyone for this.