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

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PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/201 of 9Instructions: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 15kgslides along a frictionless floor with velocity࠵?&= 5 m/s(Figure A).It suddenly explodes and breaks into two pieces (Figure B):Thepieces travel along the floor in a straight line along the x-axis.piece 1,࠵?-= 5 kg,࠵?-= 2 m/spiece 2,࠵?/= 10 kgConsider how you might find the final velocity v2 of m2.Identifythe Big Idea-Justification pair that applies to finding the velocity of piece 2.a) Conservation of kinetic energy because conservation of kinetic energy alwaysoccurs when momentum is conserved.b) Conservation of momentum because in the absence of a net external forceexplosions conserve the total momentum.c) Conservation of momentum applied only to piece 2 because explosionsalways conserve momentum.Plan:Writethe sequential plan steps you would use to find࠵?⃗/and thenfind thenumerical value for࠵?3⃗࠵?.Show all of your work.Plan (don’t forget your table):Q1Q2Q3Q45555
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/202 of 92. Use the definition of momentumto write the momentum of eachpiece in the final state࠵?࠵?= ࠵?࠵?࠵?࠵?+ ࠵?࠵?࠵?࠵?࠵?@= (5)(࠵?) + (10 )࠵?࠵?3. Set the initial momentum equalto the final momentum to findthe velocity of piece 2.࠵?࠵?= ࠵?࠵?75 = (5)(2) + (10 )࠵?࠵?75 − (5)(2)10= ࠵?࠵?࠵?࠵?= ࠵?. ࠵? ࠵?/࠵?
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/203 of 92)Two cars, each of mass࠵?HIJ= 950 kg,approach each other at the intersectionof Here Avenue and There Street as shown in the figure. It’s an icy day, so thestreet is frictionless.i)Calculate the center-of-mass momentum vector and then draw a diagram thataccurately illustrates the motion of the center-of-mass of cars A and B.࠵?b10 m/s࠵?⃗c8 m/s
ii)Cars A and B both fail to stop at the crosswalk.They collide and stick together.Find the momentum and velocity of the center-of-mass after the collision.
PHYSICS 101Week 8Quiz 6 FormAName:SEC:DSCORE:/204 of 9T࠵?33⃗T = U࠵?࠵?࠵?+ ࠵?࠵?࠵?= ࠵?࠵?࠵?࠵?࠵?. ࠵?࠵? ࠵?࠵? ࠵?/࠵?࠵?࠵?= ࠵?࠵?࠵?\࠵?࠵?࠵?

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