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https://session.masteringphysics.com/myct/.temView?assignmentProblemID=55796276 Phys1110 - CU Boulder Fa15 Week 9: Momentum Item 1 Signed in as Chris GinsburgHel Close Resources previous | 1 of 11 | next » Item 1 Part A A 28.0 kg block is connected to an empty 2.00 kg bucket by a cord running over a frictionless pulley The coefficient of static friction between the table and the block is 0.49 and the coefficient of kinetic friction between the table and the block is 0.30 Sand is gradually added to the bucket until the system just begins to move (Figure 1) Calculate the mass of sand added to the bucket Express your answer using two significant figures. msand= 12 kg Submit My Answers Give Up Correct Part B Calculate the acceleration of the system Express your answer using two significant figures. Figure 1 a= m/s 28.0 kg Submit My Answers Give Up Incorrect, One attempt remaining, Iry Again ide Feedback ContinueExplanation / Answer
mB*g-T = mB*a
T = mB*(g-a)...................(1)
T-fk = mA*a
T = mA*a+(mu_k*mA*g) .......(2)
From(1) and (2)
mA*a+(mu_k*mA*g) = mB*(g-a)
a(mA+mB) = g[(mB)-(mu_k*mA)]
accelaration a= [9.81*(14-(0.3*28))]/(28+14) = 1.308 m/s^2
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