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Q. End A of the bar AB rests on a frictionless horizontal surface, and end B is hinged. A horizontal force vec F of magnitude 107 {rm N} is exerted on end A. You can ignore the weight of the bar. What is the vertical component of the force exerted by bar on the hinge at B?

Q. A person stands at point P relative to two plane mirrors 90 degrees. How far away to the person's an image appear from each other in viewer?

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