A block weighing mA = 10 kg is placed on a plane with slope angle 30.0 degrees and is connected to a hanging weight of mass mB by a cord passing over a small frictionless pulley as shown in the picture. The coefficient of static friction is 0.42, and the coefficient of kinetic friction is 0.30. If the two blocks are moving, what is the force of friction?

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Q: please 4th question thank you in advance

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A: Page 1

Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.