Question

A mountain climber, who has had physics in high school, figures out the gravity at his location in the mountains. he used a 3.0m length of string and found that with a rock tied at its end, its period as a pendulum was 3.5 seconds. what was g at his location? please help!

Answer 1

i believe the period is 2pi * sqrt(r/g)
where r = 3

3.5 = 2pi*sqrt(3/g)
solve for g

Answer 2

http://en.wikipedia.org/wiki/Simple_pendulum#Period_of_oscillation

Answer 3

thanks!!