Asked by Nazharia

A Pendulum 45cm long swings through a vertical angle of 30degrees. Find the distance of the altitude through which the pendulum bob rises.

(I couldn't find this answer either :\ but can anyone please please help me! And if you can, can you also write the equation on how you found the answer cos' I can learn from it. Thanks)
Answered by bobpursley
draw the diagram. You know the angle and length, what is the vertical? 45cos30.

Now what is the height of the rise?
45-45cos30
Answered by Nazharia
but in the answer book that has no way on how to find it says its wrong.. the answer of it is 1.533cm
Answered by Reiny
The wording of the question leaves it open to two interpretation.
Is the total swing 30º or is the swing from the vertical 30º ?

bob took the second interpretation, why don't you try

45cos15º and then follow the other steps of bob's answer ?
Answered by Muhammad
LANATI
Answered by Secret
Cos15=A/45
=43.46666...
45-43.4666=1.533cm
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