- #1

ankhmor

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## Homework Statement

I am asked to calculate the value of gravitational acceleration at earth's surface given the following

Moon's period around the earth - 27 days 8 hours

Moons orbit - 60.1 times the radius of earth (6.38 x 10^6 m)

## Homework Equations

F

_{c}=(4*3.14

^{2}mR)/T

^{2}

which works out to be

g=(4*3.14

^{2}R)/T

^{2}

## The Attempt at a Solution

I am able to get the right answer (9.8 m/s

^{2}) IF i convert 27 days to MINUTES instead of proper SECONDS.

so where am i going wrong?

ive tried another method where i didvided the moons speed squared by the orbital radius and i get the same wrong answer

2.76e-3

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