The two blocks of the given figure below are attached to each other by a massless string that is wrapped around a frictionless pulley. When the bottom 4.00-kg block is pulled to the left by the constant force F, the top 2.00-kg block slides across it to the right. Find the magnitude of the force necessary to move the blocks at constant velocity. Assume that the coefficient of kinetic friction between all surfaces is 0.4. 2.0 kg 4.0 kg

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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.