The position of a moving 650-g particle is given by 7 = (2t2 +t)i + (7t² – t+4)j+ (2t³ – 4)k. Here 7 is in meters and t in seconds.  (a) What is the particle's initial velocity?  (b) What is the displacement of the particle when t = 1.7 s?  (c) What is the net force acting on the particle at that time?

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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.