
#1
Nov1310, 10:24 AM

P: 38

Hi, i have a shaft with OD = 33.40mm Wall Thickness = 3.38 mm length = 2.4m
Density of shaft = 2750 The weight per unit length that is given is 0.8555 kg/m My question is how did they get it as im using the volume formula for a cylinder which is V=Pie*h(R^2  r^2) then i times this by the density 2750 to get the mass but i get 1.111 which then divided by 2.4 would be 0.463. Where am i going wrong. Thanks for any help 



#2
Nov1310, 03:42 PM

P: 261

Check you're using the correct numbers, and remember that the inner diameter is the outer diameter minus twice the wall thickness. That caught a few folks in my class out.



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