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solutions6.pdf - PHYSICS 101 Name: Week 8 SEC: D Quiz 6...

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PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/201 of 10Instructions:Do your own work.Answer the questions below in the space provided.To receive credit you must:oExecute the problem solving technique used indiscussion.oHave correct units on all numerical answers.Please place a box around your answers.1. A block of mass 30kgslides along a frictionless floor with velocity࠵?&= 10 m/s(Figure A).It suddenly explodes and breaks into two pieces (Figure B):piece 1,࠵?.= 10 kg,࠵?.= 5 m/spiece 2,࠵?0= 20 kgThe pieces travel along the floor in a straight line along the x-axis.What is the velocity of piece 2?Plan (don’t forget your table):Q1Q2Q3Q45555
1) Use the definition of momentum to write the momentum in the initial state.2) Use the definition of momentum to write the momentum of each piece inthe final state3) Set the initial momentum equal to the final momentum to find the velocityof piece 2.
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/202 of 10Plan StepAction Step1) Use the definition of momentumto write the momentum in theinitial state.࠵?࠵?࠵?= (10)( 30)࠵?8= 300 kg m/s2) Use the definition of momentumto write the momentum of eachpiece in the final state࠵?࠵?= ࠵?࠵?࠵?࠵?+ ࠵?࠵?࠵?࠵?࠵??= (10)(5) + (20 )࠵?࠵?3) Set the initial momentum equalto the final momentum to findthe velocity of piece 2.࠵?࠵?= ࠵?࠵?300 = (10)(5) + (20 )࠵?࠵?300 − (10)(5)20= ࠵?࠵?࠵?࠵?= 12.5 ࠵?/࠵?
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/203 of 102. Two cars, each of mass࠵?EFG= 950 kg,approach each other at the intersectionof Here Avenue and There Street as shown in the figure.It’s an icy day, so the street is frictionless.What is the momentum of the center-of-massof the two car system?Calculate the center-of-mass momentum and then draw a diagram that accuratelyillustrates the motion of the center-of-mass of cars A and B.࠵?^5 m/s࠵?⃗_12 m/s
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/204 of 10Cars A and B both fail to stop at the crosswalk.They collide and stick together.What isthe momentum and velocity of the center-of-mass?
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/205 of 10

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Term
Fall
Professor
KevinPitts

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