Question

12. [5 pts] A 1.7 kg disk starts from rest at the top of a 1.1 m tall ramp. The disk has a velocity of 3.0 m/s at the bottom of the ramp. How much thermal energy is generated by friction as the disk moves from the top of the ramp to the bottom of the ramp? Show your answer in the box at the right. Show your formula(s) in the box below. 13. 15 pts) The disk in question 12 then slides up a frictionless second ramp that is 0.20 m tall. What is the velocity of the disk at the top of this second ramp? Show your answer in the box at the right. Show your formula(s) in the box below.

Answer 1

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12. Veoma 6 Case & disk is purely rolling with the help of friction Gizketlent KK, KE = kinetic Enely DE a potential Energy RK6 = Rotational kimlic Energy * KE 1=1, mv² = 1m xőzoj - PE = mght = 117x9,81x 111 * Pia 76.61615 * RKE = 1/2 IW² = 1/2 I (R) uzo Rkki20 J Eiz PE, toto Eiz 76.616J)

Е, = ke, t0 Бt Rkl2 , ④ KE2 = 1 {mv-/ X12x3² KEz=7.65J nghia Plezzos • Rkara Iwi ZE 알를늦는 RKE, 4 mwéx(la) 57.65xla RK E2 2.3.82.5 J Eza krzzt DE2 + Rkha 2 7065+ 0 +3.825 Ecz 11.47551 AE = Ei-G₂ = 76.616 – 11:475 DE = 65.1415 Thermal Enga

if no frictiona No Evagy & Ei=be kg,+PBI TRKEZ K+Pfqt Rkfas m@tmg @)+moxife) = imo't o+lymotie might = mu" tl muxta aught a KEz (144) ngh LN² Itin [V= 1,617 m/s)