Dont know where to start Physics problem?
2018-03-13 1:29 pm
A 2.77 kg object initially moving in the positive x-direction with a velocity of +4.62 m/s collides with and sticks to a 1.85 kg object initially moving in the negative y-direction with a velocity of -2.54 m/s. Find the final components of velocity of the composite object. (Indicate the direction with the sign of your answer.)
回答 (2)
2018-03-13 2:03 pm
✔ 最佳答案
Total impulse I = (2.77*4.62-1.85*2.54)final velocity V = I/(m1+m2) = (2.77*4.62-1.85*2.54)/(2.77+1.85) = 1.753 m/sec (+ x direct.)
posite component = 4.62*2.77/(2.77+1.85) = 2.770 m/sec
negative component = -1.85*2.54/(2.77+1.85) = -1.017 m/sec
2018-03-13 2:02 pm
Conservation of momentum along the x direction:
m₁ u(x)₁ + m₂ u(x)₂ = (m₁ + m₂) v(x)
2.77 (+4.62) + 1.85 (0) = (2.77 + 1.85) v(x)
4.62 v(x) = 2.77 (+4.62)
v(x) = +2.77
Conservation of momentum along the y-dirction :
m₁ u(y)₁ + m₂ u(y)₂ = (m₁ + m₂) v(y)
2.77 (0) + 1.85 (-2.54) = (2.77 + 1.85) v(y)
4.62 v(y) = 1.85 (-2.54)
v(y) = -1.02
Component along x-direction of velocity of the composite object = +2.77
Component along y-direction of velocity of the composite object = -1.02
m₁ u(x)₁ + m₂ u(x)₂ = (m₁ + m₂) v(x)
2.77 (+4.62) + 1.85 (0) = (2.77 + 1.85) v(x)
4.62 v(x) = 2.77 (+4.62)
v(x) = +2.77
Conservation of momentum along the y-dirction :
m₁ u(y)₁ + m₂ u(y)₂ = (m₁ + m₂) v(y)
2.77 (0) + 1.85 (-2.54) = (2.77 + 1.85) v(y)
4.62 v(y) = 1.85 (-2.54)
v(y) = -1.02
Component along x-direction of velocity of the composite object = +2.77
Component along y-direction of velocity of the composite object = -1.02
2018-03-13 1:44 pm
omg if i was in the way i would run i dont have time it hit mee!
2018-03-13 1:31 pm
Make a free body diagrams for the objects before and after impact.
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