Question

su Manonicter fluid, S-3 PROBLEM 3.59 се measuring a person's weight by having 3.60 A novelty scale for measuring a person ne person stand on a piston connected to a water reservoir a ma pipe is shown in the diagram. The level of the water in the stand pipe is to be calibrated to vield the person's weight in pounds force. When the person stands on the scale, the height ol the water in the stand pipe should be near eve level so the person can read it. There is a seal around the piston that prevents leaks but does not cause a significant frictional force. The scale should function for people who weigh between 270 and 1110 N and are between 1.2 and 1.8 m tall. Choose the piston size and standpipe diameter. Clearly state the design features you considered. Indicate how you would calibrate the scale on the standpipe. Would the scale be linear? Water C Piston PROBLEM 3.60 Applying the Panel Force Equations (63)

(in SI units) Can anyone solve this please?

Answer 1

The doize of 1:27 am person pressure is not affected by the stand pipe. A pipe diameter of (0.5 in) is chosen so that the can easily I see. see the water level & on calibration read the able to be the scale. : Apipe 1/4x1.272 1.27% 366 A piston -0.0027 which implies that when the water level risen to 2.4m the piston will only have moved by 0.00648 m or 6.48mm An initial deflection of the manometer would occur due to the weight of the piston. If the initial piston weighs 22 N or less, the deflation of the manometer would be, sha Wpiston - 22 YA 9810X 0.0127*3.66 = 0.048 sho = A piston or, 4.8cm.

This won't significantly affect the manometer range (0.6 to 2.4m) For calibration, known weights shall be put on the scale f the positions shall be marked on the stand pipe. The scale would be linear