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Physics, 12.12.2020 16:40 scholarlystudenttt28

Two packages are connected by a very light string that goes over an ideal pulley as shown in the figure. Package A has a mass of 4.0 kg and can slide along a rough plane inclined at 30° above the horizontal. The string acts on package A parallel to the surface of the plane. The coefficient of static friction between package A and the plane is 0.40. What minimum mass should package B have in order to start package A sliding up the ramp?

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