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Q. At a distance of 4.32m from a siren, the sound intensity is 3.75 x 10-2 W/m2. Assume that the siren radiates sound uniformly in all directions; find out the total power radiated.

Q. To recharge a 15V battery, a battery charger must move 3.3 x10^5 C of charge from the negative terminal to the positive terminal. How much work is done by the charger? State your answer in joules.

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