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€ Chrome File Edit View History Bookmarks People Window Help 100% Sat 11:11 PM a JJ5521 c Chegg C https:/ ne /www.webassign t/web/Student/Assignment-Responses/Mast?dept 654272 Q8 EE: Apps A&M; organizations TCC Miscellaneous PT WTC E Hot Schedules Onli (b) How much potential energy was stored in the compressed spring? 24.1 8. 0/1 points I Previous Answers YF13 8.P.026 My Notes Ask Your Teacher ce B, of mass mB, travels off to the right with An atomic nucleus suddenly bursts apart (fissions into two pieces. Piece A of mass mA, travels off to the left with speed VA. speed VB a) Use conservation of momentum to solve for vB in terms of mA, mB, and vA. VB (b) Use the results of part (a) to show that KA/KB mB/mA, where KA and KB are the kinetic energies of the two pieces. Do this on paper. Your instructor may ask you to turn in this work.) Submit Answer Save Progress 9. 3/3 points I Previous Answers YF13 8.P.027 My Notes Ask Your Teacher Two ice skaters, Daniel mass 69.9 kg) and Rebecca mass 50.2 kg) are practicing. Daniel stops to tie his shoelace and, while at rest, is struck by Rebecca, who is moving at 12.7 m/s before she collides with him. After the collision, Rebecca has a velocity of magnitude 7.0 m/s at an angle of 53.7 from her initial direction. Both skaters move on the frictionless, horizontal surface of the rink (a) What are the magnitude and direction of Daniel's velocity after the collision? 7,36 m/sExplanation / Answer
a)
Here , as initially the momentum is zero
after the explosion
mA*vA - mB*vB = 0
vB = (mA/mB)*vA
the speed vB is (mA/mB)*vA
b)
as kinetic energy = P^2/(2*m)
as the momentum P is same for both A and B
KA/KB = (1/*mA)/(1/mB)
KA/KB = mB/mA
the ratio of kinetic energy KA/KB is mB/mA
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