1) Two packages at UPS start sliding down the 20 ? ramp shown in the figure. Pac

Question

1) Two packages at UPS start sliding down the 20? ramp shown in the figure. Package A has a mass of 7.00kg  and a coefficient of kinetic friction of 0.210. Package B has a mass of 8.50kg  and a coefficient of kinetic friction of 0.170.

How long does it take package A to reach the bottom?

2) Two packages at UPS start sliding down the 20? ramp shown in the figure. Package A has a mass of 6.00kg  and a coefficient of kinetic friction of 0.190. Package B has a mass of 8kg  and a coefficient of kinetic friction of 0.130.

How long does it take package A to reach the bottom?

Explanation / Answer

Both packages wil l move together

Acceleration = g sin theta - (um1g+um2g)costheta/(m1 + m2) = 2.69

Time taken = sqrt( 2* distance down the ramp /2.69)

b) Acceleration = g sin theta - (um1g+um2g)costheta/(m1 + m2) = 1.917

Time taken = sqrt( 2* distance down the ramp /1.917) .............................................put the value of d and get the answer :_

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