Centripetal force and acceleration

  • Thread starter dance_sg
  • Start date
  • #1
113
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Homework Statement


The moon takes 27.3 days to circle Earth and its centre is located 3.84 x 108 m from the centre of Earth. What is the Moon’s acceleration?


Homework Equations


a=v^2/r, a=4(pi)^2mr/T^2


The Attempt at a Solution


i dont know how to answer this question becuase i dont know what im suppossed to do with the 27.3 days.
 

Answers and Replies

  • #2
532
2
Your equations look good except for the "m" in the second equation. Where did that come from?

Anyways, the units of acceleration is the meter per second per second, m/(s^2). You must convert the days to seconds. This is a common procedure for many intro physics problems.
 
  • #3
113
0
so then i would just use the second equation i provided(excluding the m) plug everything in and get an answer of 2.72 x 10^-3 m/s2??
 
  • #4
1,386
61
Yups
 

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