Wednesday

April 23, 2014

April 23, 2014

Posted by **Michael** on Sunday, December 7, 2008 at 3:21pm.

- astronomy/physics -
**tchrwill**, Sunday, December 7, 2008 at 6:37pmThe gravitational force of attraction of the Sun on the Earth, or the Earth on the Sun, is given by Newtons Universal Law of Gravitation

F = GMm/r^2

where F is the attractive force, G is the Universal Gravitational Constant, 1.069304x10^-9, M is the mass of the Sun, m is the mass of the earth, and r is the distance between them. This force of attraction of the Sun on the earth is what causes the centripetal acceleration which constantly accelerates the Earth toward the Sun, keeping it in its orbit at a mean distance of 92,960,242 miles. This centripetal force is expressed by F = mV^2/r where m is the mass of the earth, V is the orbital velocity of the Earth, and r the radial distance of the Earth from the Sun.

Since these two forces are equal to one another, we may write

F = GMm/r^2 = mV^2/r

from which we derive the mass of the Sun as

M(S) = rV^2/G.

Taking the mean distance between the Earth and the Sun as 92,960,242 miles, and the Earth's mean orbital velocity of 07,741 ft/sec., we can write for the mass of the Sun

M(S) = [(92,960,242(5280))97,741^2]/1.069304x10^-9 = 4.385x10^30 lb. mass.

Applying the same logic to the known information about the Earth and Moon:

The Moons mean orbital velocity is ~3340 ft/sec. while its mean distance may be taken as ~238,868 miles. Therefore, for the mass of the Earth we get

m(E) = [(238,868(5280))3340^2]/1.069304x10^-9 = 1.315x10^30 lbs. mass.

Now apply the same logic to your specific problem.

**Related Questions**

Physics - The Moon orbits the Earth at a distance of 3.85 x 108 m. Assume that ...

Physics - The mass of the Moon is 7.35x10 to the 22nd Kg. At some point between ...

Physics - A planet has two satellite moons. Moon X has an orbital period of 2....

physics - A planet has two satellite moons. Moon X has an orbital period of 2.13...

Physics I am lost please help - A planet has two satellite moons. Moon X has an ...

Physics 1111: Orbitals and Distance - A planet has two satellite moons. Moon X ...

Physics - A planet has two satellite moons. Moon X has an orbital period of 2.13...

Physicsss - A planet has two satellite moons. Moon X has an orbital period of 2....

Astronomy - If the sidereal period of the moon was 29.0 days(instead of the 27....

Physics (please help!!!!) - Mars orbits the Sun at a mean distance of 228 ...