Physics Help Forum Cylindrical roll of paper

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 Nov 7th 2018, 11:15 PM #1 Member   Join Date: Apr 2017 Location: Turkey Posts: 48 Cylindrical roll of paper Greetings to all Any help to solve this problem ? i will be so thankful . Best regards Attached Thumbnails
 Nov 8th 2018, 01:19 AM #2 Senior Member   Join Date: Apr 2017 Posts: 499 So all the energy for movement comes from the lowering of the high of the paper ... we must assume there is zero loss At time 0 the paper is stationary with it's center of mass a height R above the table ... At any moment after that the height (and mass) of the roll has been reduced and this is the energy which goes .. 1 ... into the rotation of the remaining roll (you need moment of inertia and angular speed) 2. ... into the forward velocity of the remaining roll (1/2 m v squared) Last edited by oz93666; Nov 8th 2018 at 01:21 AM.

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