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no ieda how to slove it.

a https://session.masteringphysics.com/myct/itemView?assignmentProblemID-49709607 Phys 211/221 Spring 2015_Campus Assignment #4 Problem 7.35 Help | Close Resources « previous 38 of 39 next» Problem 7.35 Part A The lower block in the figure is pulled on by a rope with a tension force of 20 N. The coefficient of kinetic friction between the lower block and the surface is 0.29. The coefficient of kinetic friction between the lower block and the upper block is also 0.29 (Figure 1) What is the acceleration of the 2.0 kg block? Express your answer to two significant figures and include the appropriate units -ValueUnits Submit My Answers Give Up ovide Feedback Continue Figure 1 of 1 1 kg 20 N 2 kg

Explanation / Answer

Now Concentrate Complewtely on Lower Block

Imagine its Free Bod Diagram What are the Forces Acting on it

1)Pulling tetnsion Towards Right = 20 N

2)Friction From Ground= u1*N = 0.29(2+1)*(9.8) = 8.526 N Towards Left

3)Friction From Upper Block =u1*N = 0.29*1(9.8)=2.842 N Towards Left

4)tension From Pulley Rop = T= Friction From Upper Block =u1*N = 0.29*1(9.8)=2.842 N Towards Left

Now adding up all the Forces adding up and Right side as positive

F net = 20 - 8.526 - 2.842 - 2.842 = 5.79 N

F= ma = 5.79

a = 5.79 / 2 = 2.895 m/s^2

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