# Solutions 8.pdf - PHYSICS 101 Name: Week 11 Quiz 8 Form A...

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PHYSICS 101Week 11Quiz 8 FormAName:SEC:DSCORE:/201 of 9Instructions:1. Do your own work.2. Answer the questions below in the space provided.3. To receive credit you must:oExecute the problem solving technique used indiscussion.oHave correct units on all numerical answers.4. Please place a box around your answers.1) Consider the system of two disks as shown in the diagram.The importantparameters are given in the table:Disk Ainitially rotates counter-clockwise and,Disk Binitially rotates clockwise asshown in theInitialdiagram.Disk Asuddenly falls resulting in the situation in theFinaldiagram.What is the final rotational speed of the system in theFinaldiagram?DISKMASS (kg)RADIUS(m)MOMENT OFINERTIAA300.3(1 2⁄ )࠵?࠵?B150.3(1 2⁄ )࠵?࠵?DISKINITIAL࠵?rad/sA15B−30Q1Q2Q3Q45555++
PHYSICS 101Week 11Quiz 8 FormAName:SEC:DSCORE:/202 of 9Plan:Order the following steps into the most useful order, then find the final rotationalspeed.A. Solve for࠵?0.B. Find the initial angular momentum.C. Apply conservation of angular momentumPlanStepExecutionB࠵?࠵?= ࠵?࠵?࠵?࠵?+ ࠵?࠵?࠵?࠵?= 8࠵?࠵?; ࠵?࠵?(࠵?࠵?࠵?࠵?+ ࠵?࠵?࠵?࠵?)=࠵?࠵?(࠵?. ࠵?)࠵?[(࠵?࠵?)(࠵?࠵?) + (࠵?࠵?)(−࠵?࠵?)] = ࠵?C࠵?࠵?= ࠵?࠵?= ࠵?A࠵?࠵?࠵?࠵?࠵?= ࠵?, therefore,࠵?࠵?= ࠵?
PHYSICS 101Week 11Quiz 8 FormAName:SEC:DSCORE:/203 of 92) The USS PHYS 101 is drifting through space toward Mars.When the USS PHYS101 is a distance࠵?FGFH= 2 × 10Jmfrom the surfaceof Mars, it has speed࠵?FGFH7860 m/s.It continues to drift toward Mars under its gravitational pull.=

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