Help please :( - Flange Bolt coupling

A flanged bolt coupling consists of two concentric bolt circles. One bolt circle consists of six 0.5-in-diameter steel bolts on a circle 9 inches in diameter and the other consists of eight 0.5-in-diameter steel bolts on a circle 12 inches in diameter. What is the shearing stress in the bolts if a torque of 7 kip-ft is to be carried by the assembly?

Homework About Torsion

The solid compound shaft, made of three different materials, carries the two torques shown. (a) Calculate the maximum shear stress in each material. (b) Find the angle of rotation of the free end of the shaft. The shear moduli are 28 GPa for aluminium, 83 GPa for steel and 35 GPa for bronze.

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Beam Deflection

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hi please help me with my assignement.

this beam made of steel with moduus youg of 300 gpa, cross sectional area A1 =10.10^-6 m2
A2 = 20. 10^-6 m2.
length L1 = 2m
Length L2 =1,8 m.

at he level that is very rigid ring mounted to apply the load F=8 KN.

questions :
1.calculate reaction pedestal points A and B
2. stresses that ocur in cross section A1 and A2
3. the displacement Point C.