A System of Blocks and a Frictionless Pulley Is Shown

question 34

Multiple Choice

A system of blocks and a frictionless pulley is shown in the figure.Block A has a mass of 2.0 kg and is on a rough horizontal surface for which μ_s = 0.40 between the surface and block A.The rope pulls horizontally on block A.Block C has a mass of 1.0 kg.An external force P = 23.0 N,applied vertically to block A,maintains the system at rest as shown in the figure.What is the friction force on block A?

• A)6.3 N
• B)6.9 N
• C)7.5 N
• D)5.7 N
• E)5.1 N

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