300 Lamp Ac
300 Lamp Ac
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Statics problem help?
Ok, I have been trying to do this for an hour and can't get it and it's annoying. A 40 lb lamp is suspended by 2 cables AB and AC, and each have an initial length of 5 ft. Cable AB consists of aluminum (Modulus of Elasticity = 10 * 10^6 psi, and v (poisson's ratio) = .333). Cable AC is made of steel (Elasticity = 30 * 10^6, with v = .300). AB has an initial diameter of .1 in and AC of .05 in. We have to calculate the normal stress in AB and AC, which is 4.244 ksi for AB and 16.98 ksi for AC. Then find the change in length of AB and AC. Then the change in diameters of AB and AC. I can't find these changes in length and changes in diameter. The answers are (change in Length AB) = .02546 in.; (change in Length AC) = .03396 in. ; (change in diam. AB) = -14.13*10^(-6) in. ; and (change in diam. AC) = .03396 in. How do you find this?
my wife (the civil engineer) says
The is a mechanics of materials question and the equations you need to find these answers would be in Mechanics of materials text book. She'd look for them for you, but our basement is so full of junk from the remodeling of the upstairs that it just isn't going to happen. Hopefully telling you to look in the mechanics of materials text will be helpful.
She didn't really 'get' this class until the very end. Good luck.