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AP PHYSICS

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A stone is tied to a string (length = 0.450 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in the string is 18.0% larger than the tension that exists when the circle is horizontal. Determine the speed of the stone.
I know how to figure it out. Just how do you get the radius?

  • AP PHYSICS -

    isn't the radius the length of the string?

  • AP PHYSICS -

    The speed of the stone when? It changes in the vertical circle.

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