A person stands on a scale inside an elevator at rest (see the figure below). The scale reads W = 675 N. (a) What is the person's mass? kg (b) The elevator accelerates upward momentarily at the rate of a = 3 m/s2. What does the scale read then? N (c) The elevator then moves with a steady speed of 6 m/s. What does the scale read now? N

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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.