1.A 2 m diameter semicircular channel made of brickwork is to transport water to a distance of 1.7 km uniformly. If the flow rate is to reach 200 m3/min when the channel is full, determine the minimum elevation difference across the channel.
2.The pressurized tank shown was fabricated by welding strips of plate along a helix forming an angle ? (beta) with a transverse plane as indicated below. Determine the largest value of ? (beta) that can be used if the normal stress perpendicu lar to the weld is not to be larger than 85% of the maximum stress in the tank.