A 320 cm high vertical pipe at 150 C wall temperature is in room with still air at 10 C. This pipe supplies
heat at the rate of 8 kW into room air by natural convection. Assuming laminar flow, the hegiht of the pipe
needed to supply 1 kW only is
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120 men working 9 hours a day can construct a road
in 40 days. How long would it take to construct the
same road if 150 men work 6 hours a day on it?
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