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Q. Pull horizontally on a crate with a force of 140 N and it slides across the floor in a dynamic equilibrium. How much friction is acting on the crate?

Q. Two metal rods-one copper, the other lead-are connected in parallel with a temperature of 21° C at one end and 106° C at the other end. Both rods are 0.688 m in length, and the lead rod is 2.88 cm in diameter. If the combined rate of heat flow through the two rods is 33.9 J/s, what is the diameter of the copper rod?

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