- #1
seto6
- 251
- 0
[urgent] finding mass enclosed my a stars radius from center.
the rotational speed of an orbiting object is given by v= (Gm/R)^1/2where R is distance at which the object is rotating from the center of the mass distribution and M is the amount of mass within the radius R. for the distribution in a disk, the mass enclosed increases with R^2. the sun rotates in the ids of the Galaxy at distance of 8Kpc and a speed of 220km/s find the rotational speed of a star in the disk that is located at a distance of 12Kpc from the center of Galaxy.
i have no clue how to do this question. it was on my quiz but didn't know how to do. i really need help.
the equation is given in the question.
i have no clue how to start this.
i tried using v is proportional to M/R but it does not work
Homework Statement
the rotational speed of an orbiting object is given by v= (Gm/R)^1/2where R is distance at which the object is rotating from the center of the mass distribution and M is the amount of mass within the radius R. for the distribution in a disk, the mass enclosed increases with R^2. the sun rotates in the ids of the Galaxy at distance of 8Kpc and a speed of 220km/s find the rotational speed of a star in the disk that is located at a distance of 12Kpc from the center of Galaxy.
i have no clue how to do this question. it was on my quiz but didn't know how to do. i really need help.
Homework Equations
the equation is given in the question.
The Attempt at a Solution
i have no clue how to start this.
i tried using v is proportional to M/R but it does not work