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Q. Three identical 6.00 masses are hung by three identical springs, as shown in the figure. Each spring has a force constant of 8.40 and was 15.0 long before any masses were attached to it. How long is each spring when hanging as shown? (Hint: First isolate only the bottom mass. Then treat the bottom two masses as a system. Finally, treat all three masses as a system.)

Q. A straight wire 6.0 m long carries 30 microC} distributed uniformly over its length. Find the electric field strength 11 cm from the wire axis, not near either end. Find the electric field strength 400 m from the wire.

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