Problem 7-51 Energy cons. - Part 4 - C
A boy is playing with a rope tied to a tree near his favourite swimming hole. Initially the boy is stationary and the rope (of length 3.7m) makes an angle of 48∘ with the vertical. He then lifts his feet slightly and starts to swing freely. If air resistance is neglected, use conservation of energy to determine:
(a) his speed at the bottom of the swing
(b) the minimum height, relative to his initial position, to which he can swing.
Accumulated Solution
At point 2, EP=0
At point 2, EK=(1/2)mv2
No. But close. What is 3.7cos48 on the drawing and where is the origin?