Direct Stress and Strain

A steel rod having a cross-sectional area of 0.005m2 and length 3m is attached to supports. Find (a) the force exerted by the rod on the supports if the temperature falls 60 degress and the supports are unyielding. and (b) the force exerted by the rod on the supports if they yield 0.0002m while the temperature raises 50 degrees. Take E=210Gpa, coefficient of thermal expansion = 10.5x10-6 degrees-1

Mechanics of materials

Two solid steel shafts (G = 11.2 x 106 psi) are connected by the gears shown. Ends B and D are fixed. Assume points A and C are where the gears meets the shafts. What is the maximum shear stress in shaft CD under the loading shown? Choose One: 7.832ksi 6.987ksi 6.443ksi 5.844ksi What is the angle through which end C rotates? Choose One: .0167rad .0302rad .0459rad .0573rad

Applied Loads, Young's modulus, Poisson's ratio

The Young's modulus and the Poisson's ratio for copper are 124.8 GPa and 0.36 respectively. When a tensile load is applie to a 1.5cm diameter copper rod, the diameter is reduced to 1.498cm. WHat is the correct applied load? a) 81,640N b) 73,500N c) 82,550N

Diffusion Coeffiecient, Calculate Constant

The diffusion coeffiecient for Cr^+3 in Cr2O3 is 6x10^-15 cm2/s at 727 degrees Celcius and is 1x10^-9 cm2/s at 1400 degrees Celcius. Calculate the constant D0. Use the value of the Gas constant R+1.987 cal/mole.K a) 0.015 cm2/s b) 0.055 cm2/s c) 0.25 cm2/s

Carbon content of steel

A steel contains 55% alpha-ferrite and 45% gamma-ferrite or austenite at 750 degrees celcius. What is the carbon content of steel? a) 0.25% b) 0.5% c) 0.28% ****This is how the problem was written however Im not sure if it makes sense that 55% and 45% are supposed to be 0.55% and 0.45%**** My guess at the answer is (b), can you explain?