where dos the 0.5 come from? Example on Conservation of Mechanical EnergyThe man at the window wishes to throw the 30 kg sack on theground. To do this he allows it to swing from rest at B to pointC, when he releases the cord at 0 = 30°. Determine the speedat which it strikes the ground.Conservation ofMechanical EnergyВ8 mKg + UB = Kp + Up%3D8 m0 + (16)(30)(9.8) = (0.5)(30)v,² + 0Vo? = (16)(30)(9.8) / (0.5)(30)Vo = 17.7 m/s16 mNote that the tension in thecord does no work on the\Dsack because it is alwaysperpendicular to thedisplacement!0 2007 by R.C. Htbeier. To be published by Pearson Prentice Hal, Pearson Education, Inc, Upper Sadde River New Jersey All rights reserved

Using law of conservation of mechanical energy is KEB+UB=KED+UDmgh=12mvD2

The man at the window wishes to throw the 30 kg sack on the ground. To do this he allows it to swing from rest at B to point C, when he releases the cord at 0 = 30°. Determine the speed at which it strikes the ground. Conservation of A Mechanical Energy B 8m Kg + Ug = Kp + U, 8 m 0 + (16)(30)(9.8) = (0.5)(30)v,² + 0 Vo? = (16)(30)(9.8) / (0.5)(30) 16 m Vo = 17.7 m/s Note that the tension in the cord does no work on the sack because it is always perpendicular to the displacement! R 0 2007 by RC Htbeier To be published by Peason Prentice Hal Peason Education, Inc, Upper Sadde River. New Jeey All ights reseved

The man at the window wishes to throw the 30 kg sack on the ground. To do this he allows it to swing from rest at B to point C, when he releases the cord at 0 = 30°. Determine the speed at which it strikes the ground. Conservation of A Mechanical Energy B 8m Kg + Ug = Kp + U, 8 m 0 + (16)(30)(9.8) = (0.5)(30)v,² + 0 Vo? = (16)(30)(9.8) / (0.5)(30) 16 m Vo = 17.7 m/s Note that the tension in the cord does no work on the sack because it is always perpendicular to the displacement! R 0 2007 by RC Htbeier To be published by Peason Prentice Hal Peason Education, Inc, Upper Sadde River. New Jeey All ights reseved

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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1 E:17 Q.3.jpg Example: which of the following are possible reaction Xe+Sr +2,n 1- 'n+ U →* 2– ¿n+ U →* Sn + Mo +3¿n → I+ Nb+3,n 235 140 94 54 38 1 235 132 101 2- n+U 50 1 239 127 3- n+ Pu 94 41