I just worked out (3.) using the same method.
I found the distance between the Earth and the sun to be 1.5E11m.
v=2piR/T
= 2pi (1.5 E 11) / (365*24*60*60)
= 2.99 E 4
V^2 = 8.95 E 8 = Gm/R
8.95 E 8 = (6.67E-11)(m) / (1.5E11)
m = 2 E 30 kg
Established answer: m = 2 E 31 kg
v = 2piR/T
= 2pi(3.84E8)/(28*60^60)
=2.41 E 4
v^2 = 5.82E8 = Gm/R
5.82E8 = (6.67E-11)(m)/(3.84E8)
m = 3.35 E27 kg
What the answer is supposed to be: m = 5.98 E24 kg
The radius of the moon's orbit is 3.84 * 10^8 m. (I just googled it haha).
I plugged that into v = 2piR/ T to find v, then used v^2 = Gm/R to find the mass, but my answers still don't match up :/
There aren't many girls in the physics program in my school.
I hear some college admissions are easier on girls who want to major in physics/engineering/compsci
[SOLVED] gravity fun
Homework Statement
1. Calculate the speed of objects on the Earth's surface caused by the Earth's own rotation around its own axis.
2. Find the mass of the Earth using its time period of revolution of the moon around the earth.
3. Find the mass of the sun using the...
Homework Statement
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