Finding pendulum length and speed at the bottom given period and angle

[yosup231]

Please Help!

ok could someone plesae help me with this question

I had to draw a pendulum and the questions asks what is the length of the pendulum if the period is .75 s so i got .142 m then it asks what is the speed of the pendulum at the bottom of its swing if the angle that makes its maximum displacement is 11 degrees? wow do i do that... I have no idea?


PLEASE HELP!

 

[yosup231]

c'mon 11 views no help I am sure someone out there knows it

 

[Tide]

HINT 1: What is the difference in height between the highest and lowest positions of the pendulum.

HINT 2: Energy is conserved. :)

 

[yosup231]

difference is .142m - .03m i don't see how it helps

 

[yosup231]

is the answer by any chance .16 or .23

 

[Tide]

What are the units of speed? And how did you get those numbers?

 

[yosup231]

.23 m/s

(2pi/T)A
(spi/.75)(.142sin11)= .23m/s