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Q. If you submerge 100g of 40°C nails in 100 g of 20° water with the specific heat of iron is 0.12cal/g *°C. what is the heat gained by the water to the heat lost by the nails. Can you show that the final temperature of the water becomes 22.°C.

Q. Two identical positive charges exert a repulsive force of 6.2 multiplied by 10-9 N when separated by a distance of 3.4 multiplied by 10-10 m. Calculate the charge of each?

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