Posted by akeb on .
a pendulum 45 cm long swings through a vertical angle of 30 degree.find the height through which the pendulum bob rises.

maths 
Henry,
Center: A = 0 Deg.
Left of Center: A = 15 Deg.
Right of Center: A = 15 Deg.
h = 45*sin15 = 11.65 cm.