The following forces are acting on a 250 g box on a horizontal surface: A downward force of gravity with magnitude 2.45 N. An upward normal force with magnitude 2.45 N. A rightward pull from a rope of 5.0 N. A leftward kinetic friction force with magnitude 7.5 N. At this instant, what is the magnitude of the acceleration of the box?

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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.