Two nails are hammered into the wall at the same height off the ground and with a horizontal separation of d = 13 cm. A loop of string (mass density 4.0 g/m) is hung around the nails so that the nails are inside the loop. Then a mass m = 1.9 kg is hung from the bottom segment of string, and as a result the string forms a taut equilateral triangle. (As- sume that the nails behave like frictionless pulleys, and we may model the tension as being the same everywhere in the loop of string.) If the top segment of string were lightly plucked, what fundamental frequency f would be heard? For the limit check, investigate what happens to f if the hanging mass grows large (m → ∞). -

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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.