1.(adsbygoogle = window.adsbygoogle || []).push({}); What is the maximum speed with which a 1050-kg car can round a turn of radius 77 m on a flat road if the coefficient of static friction between tires and road is 0.80?What does the static friction have to do with this problem? Is the centripetal force equal to this friction? WHy?

2.A bucket of mass 2.00kg is whirled in a vertical circle of radius 1.10 m. At the lowest point of its motion the tension in the rope supporting the bucket is 25.0 N. a) Find the speed of the bucket. b) How fast must the bucket move at the top of the circle so that the rope does not go slack?for a), I got Fcp=Ft-Fg, ('t' means tension) but someone said it was Fcp=Ft+Fg. But tension and the gravity acts in opposite direction at the lower point?! for b), someone said Ft=0? why?

Thanks.

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# Homework Help: Circular Motion and static friction

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