Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
Intro Physics Homework Help
Advanced Physics Homework Help
Precalculus Homework Help
Calculus Homework Help
Bio/Chem Homework Help
Engineering Homework Help
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Homework Help
Introductory Physics Homework Help
Calculating the mass of the Earth
Reply to thread
Message
[QUOTE="ccapanni, post: 5176724, member: 564566"] [h2]Homework Statement [/h2] The distance between the centres’ of the Earth and Moon is estimated to be 3.84x10^8 m. If the lunar month is 27.3 days, calculate the approximate mass of the Earth. (Assume the gravitational constant G=6.67x10^-11 Nm2 kg-2) [h2]Homework Equations[/h2] [/B] T = 2pi / sqroot(G * Mearth) * r^3/2 [h2]The Attempt at a Solution[/h2] 27.3 = 6.283 / sqroot(6.67x10^-11 * Mearth) * 3.84x10^3/2 27.3 * sqroot(Mearth) = (6.283 / 8.14 x10^-6) * 7.525x10^12 27.3 * sqroot(Mearth) = 771867.3 * 7.525x10^12 27.3 * sqroot(Mearth) = 5.81x10^18 sqroot(Mearth) = 5,81x10^18 / 27.3 sqroot(Mearth) = 2.13x10^17 Mearth = 4.53x10^34 Lunar Month / Earth Month = 30.4/27.3 = 1.114 Mass Earth = 4.53x10^34 * 1.114 = 5.04x10^34 kg This is far too large a nuber for the mass of the earth, considering that it is in the region of Nx10^24 kg, What am i doing wrong? [/QUOTE]
Insert quotes…
Post reply
Forums
Homework Help
Introductory Physics Homework Help
Calculating the mass of the Earth
Back
Top