OpenStudy (anonymous):
HELP PLEASE: A 15kg child sits in a swing that is attached to ropes 1.6m long. Find the potential energy of the child relative to his lowest position when the ropes (a) are horizontal, (b) are vertical, and (c) make 30 degrees with the horizontal.
OpenStudy (anonymous):
Compare this situation with the swinging of a pendulum. When the ropes are horizontal the relative height of the child is equal to the length of the ropes=h=1.65m We know, potential energy, U=mgh here, m=mass of the child Imagine, what would be the height of the child relative to the lowest position. The lowest position is the position when it hangs at the nearest distance from the earth. draw a fig by yourself of the position of the situation at 30 deg with horizontal.and find the height. Then get the U!
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