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Q. A large steam pipe is covered with 1.7-cm-thick insulating material of thermal conductivity 0.21 J/(s m °C). How much energy is lost every second when the steam is at 185 °C and the outside of the pipe has a temperature of 20°C? The pipe has a circumference of 7.25 m and a length of 50 m. Neglect losses through the ends of the pipe.

Q. Two charged bodies exert a force of 0.185 N on each other. If they are moved so that they are one-fourth as far apart, what force is exerted?

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