Water from a main canal is siphoned to a branch canal over an embankment bymeans wrought iron pipes of 9 cm diameter. The length of pipe up to the summitis 25 m and the total length is 65 m. Water surface elevation in the branch canalis 10 m below that of the main canal(i) How many pipes are needed if the total quantity of water required to be conveyed is 60 litre/sec?(ii) What is the maximum permissible height of the summit above the water level in the main canal so that the water pressure of summit may not fall below 0.2 bar absolute, the barometer reading being 10 m of water?Entry loss may be assumed as one-half of the velocity head in the pipe and takefriction factor f= 0.0075.
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Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?