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

Question

(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)

Answer 1

draw the diagram. You know the angle and length, what is the vertical? 45cos30.

Now what is the height of the rise?
45-45cos30

Answer 2

but in the answer book that has no way on how to find it says its wrong.. the answer of it is 1.533cm

Answer 3

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 ?

Answer 4

LANATI

Answer 5

Cos15=A/45
=43.46666...
45-43.4666=1.533cm