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[" A heavy mass is attached to a thin wi...

[" A heavy mass is attached to a thin wire and is whirled "],[" in a vertical circle.The wire is most likely to break "],[" (a) when the mass is at the highest point "],[" (b) when the mass is at the lowest point "],[" (c) when the wire is horizontal "],[" (d) at an angle of "cos^(-1)(1/3)" from the upward vertical."]

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