A picture of mass m = 11 kg is hung on a wall from a hook with a piece of wire. The picture hangs level and is centered on the hook. The tension in the wire is the same on both sides of the hook. Each section of wire makes the same angle with the horizontal. Refer to the figure. a.  Choose the best free body diagram.  b. Initially the picture is hung with a short wire, such that θ1 = 13°. What is the tension in the wire, in newtons.  c. The wire is replaced with a longer wire. The picture now hangs with θ2 = 49°. What is the new tension in the wire, in newtons.

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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.