P150_Exam2_W08sol - Physics 150 1 2 3 4 5 6 7 8 9 10 Answer...

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6. Answer = E 16. Answer = B 7. Answer = B 17. Answer = C 8. Answer = C 18. Answer = D 9. Answer = E 19. Answer = A 10. Answer = C 20. Answer = D Physics 150 Exam #2 Solution 3/14/08 1. Answer = A 11. Answer = C 2. Answer = C 12. Answer = C 3. Answer = B 13. Answer = B 4. Answer = E 14. Answer = E 5. Answer = C 15. Answer = E
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t 4.27 sec = t Impulse F := Impulse = force*time D) Impulse 28.59kgmsec -1 = Impulse p := Impulse Momentum Theorem: C) p -1 = p p x 2 p y 2 + := p y 25.2 kgmsec -1 = p y mass v fy := p x 13.5 kgmsec -1 = p x mass v ix := B) Physics 150 Exam #2 Solution 3/14/08 Problem #1: mass 3 kg := v ix 4.5 m sec := v fy 8.4 m sec := F 6.7 N := A) K i 1 2 mass v ix 2 := K i 30.38J = K f 1 2 mass v fy 2 := K f 105.84 J = KK f K i := K 75.47J = Work Energy Theorem: W K := W 75.47kgm 2 sec -2 =
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K b 0J := Ball is instantaneously at rest. U b mass g L := E b U b K b + := E b 1.89 J = The only force acting is gravity and that is a conservative force. Hence the mechanical energy must be conserved. E 0 E b := E 0 1.89 J = K 0 E 0 U 0 := K 0 1.89 J = E) Conservative forces: E a E 0 := K a E a U a := K a 3.77 J = F) E c E 0 := U c U 0 := K c E c U c := K c 1.89 J = rL := v c 2K c mass := v c 2.62 msec -1 = a c v c 2 r := a c 19.6 msec -2 = Physics 150 Exam #2 Solution 3/14/08 Problem #2: mass 0.550 kg := L 0.350 m := J1 N m := A) Work F d := Work gravity F g
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P150_Exam2_W08sol - Physics 150 1 2 3 4 5 6 7 8 9 10 Answer...

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