Engineering - Mechanical Principles - Fluid Systems?

Posted on 2016-05-17 18:44:00 in Engineering by RICY

I have some Mechanical Principles questions that I don't understand. Can anyone explain the steps and the answers?

3) Oil with a density of 885 kg/m3 (3 for cubed) is flowing along a pipe which tapers in the centre. The speed of the oil along the middle of the pipe (second section) (the smaller, tapered section) is 12.0 m/s. The pipe diameter at this point is 72.0 mm, 
a) Calculate the volume flow rate and the mass flow rate through the middle (second)(smaller, tapered) section. 
b) The oil is to be delievered to the first section of the pipe (left) (not tapered, normal size) from an external supply at 3.40 m/s. The oil is to exit the third (last) section of the pipe at 1.90m/s. 
Calculate the required pipe diameters at the left (first) section and the right (last) section of the pipe. 

A laboratory needs to evaluate the density of test specimens in four different situations: 
a) A liquid using a density bottle method. 
b) A solid using a density bottle method. 
c) A liquid using a flotation method. 
d) A solid using a flotation method. 

Describe, with the help of annotated diagrams, how you would measure the density in each of these situations, explaining how good each method is in terms of accuracy and precision.

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