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Summersnow8

  • one year ago

(1) A bullet with mass 50.0 g is fired with an initial velocity of 625 m/s from a gun with a mass 3.50 kg. What is the speed of recoil (in m/s) of the gun? (2) How many Newtons of force are required to stop a truck 2250 kg truck going 32.0 km/h in 4.00s?

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  1. shamim
    • one year ago
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    1) Use conservation of momentum law

  2. shamim
    • one year ago
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    m1*u1+m2*u2=m1*v1+m2*v2

  3. Summersnow8
    • one year ago
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    what does u stand for?

  4. Summersnow8
    • one year ago
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    could you work me through it? i'm not too familiar with that formula

  5. shamim
    • one year ago
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    m1=mass off bullet=50g=?kg m2=mass of gun=3.5kg u1=initial velocity of bullet=0 u2=initial velocity of gun=0 v1=final velocity of bullet =625m/s v2=?

  6. shamim
    • one year ago
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    v2=recoil speed of gun

  7. shamim
    • one year ago
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    No

  8. Summersnow8
    • one year ago
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    (0.05 kg)(625 m/s)+(3.5 kg)(0 m/s)= (0.065 kg)(625 m/s)+ (3.5 kg)v2

  9. shamim
    • one year ago
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    m1=50g=50/1000kg=.05kg Right?

  10. rajat97
    • one year ago
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    i think it should be (0.05 kg)(0 m/s)+(3.5 kg)(0 m/s)= (0.06 kg)(625 m/s)+ (3.5 kg)v2

  11. shamim
    • one year ago
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    .05*0+3.5*0=.05*625+.05*v2 v2=?

  12. shamim
    • one year ago
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    Why .06 kg?

  13. rajat97
    • one year ago
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    oh! i'm sorry

  14. rajat97
    • one year ago
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    *0.05kg

  15. Summersnow8
    • one year ago
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    i got 31.25 = 31.25 + 3.5 V2

  16. rajat97
    • one year ago
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    no you may be using the wrong equation the correct one is 05*0+3.5*0=.05*625+.05*v2 as @shamim said

  17. shamim
    • one year ago
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    .05*0=0 Right?

  18. rajat97
    • one year ago
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    so you should get -31.25=3.5v2 and i posted the wrong equation it should be 05*625+3.5*v2

  19. shamim
    • one year ago
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    3.5*9=0 Right?

  20. shamim
    • one year ago
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    0+0=0 Right?

  21. Summersnow8
    • one year ago
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    V2 = -8.9285 m/s, but since speed is scalar it is just 8.9285

  22. shamim
    • one year ago
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    Left hand side of my equation will b 0 Right?

  23. shamim
    • one year ago
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    - reveals v1 nd v2 r oposit in direction

  24. shamim
    • one year ago
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    Ur bullet is going to forward nd ur gun is going to backward

  25. Summersnow8
    • one year ago
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    how do I solve #2 now?

  26. shamim
    • one year ago
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    Who will get medal?????!!!!!

  27. Summersnow8
    • one year ago
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    whoever helps me solve both problems

  28. Summersnow8
    • one year ago
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    How many Newtons of force are required to stop a truck 2250 kg truck going 32.0 km/h in 4.00s?

  29. shamim
    • one year ago
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    U should post ur second question again in another post

  30. Summersnow8
    • one year ago
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    ok

  31. rajat97
    • one year ago
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    thanks for the medal @Summersnow8

  32. Summersnow8
    • one year ago
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    @rajat97 no problem

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