Seminar-4b-solutions - Faculty of Engineering and Department of Physics ENPH 131 Last Name Seminar 7 FBD\/KD II Normal and Tangential Coordinates First

Seminar-4b-solutions - Faculty of Engineering and...

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Faculty of Engineering and Department of Physics ENPH 131 Last Name: Seminar 7 FBD/KD II: Normal and Tangential Coordinates First Name: ID Number: Starting Mar 07, 2016 Seminar Section: Please do all work on handout and box final numerical answers. Total=20 marks. 1.[5] You tie a cord to a pail which has a golf ball at the bottom of the pail. You then swing the pail in a vertical circle of radius 0.600 m. a.[2] Draw the free-body diagram and the kinetic diagram for the golf ball in the pail at the highest point of the circle. [1 mark for each diagram] b.[3]What minimum speed must you give the pail at the highest point of the circle if the golf ball is to remain at the bottom of the pail and not fall out? 2 v N mg m U ± [1 mark] At minimum speed, 0 N . [1 mark] Hence ² ³² ³ 2 9.81 0.600 2.43 v mg m v g U U m/s. [1 mark]

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