Task 4: A solid steel shaft in a rolling mill transmits 20 KW of power at 2 Hz. Determine the smallest safe diameter of the shaft if the shear stress Tw is not to exceed 40 MPa and the angle of twist O is limited to 6° in a length of 3m. Use G= 83 GPa.

I really need help with this! Please answer it using the Maximum shear stress theory, and also be very clear with your explanation. Thank you!

A shaft made from acrylic is subjected to the three torques indicated below. The acrylic has a shear modulus of 1.7 GPa. Determine: a. The twist at the end D if the diameter if the shaft is 100 mm. b. The minimum shaft diameter if Tallow = 10 MPa 200 N•m A 800 N•m 300 mm B 400 N•m 600 mm C 600 mm

An automobile engine develops a maximum torque of 162Nm. The low gear ratio of transmission is 2.75, while the back axle ratio is 4.25. The effective wheels radius is 0.325m and the co-efficient of friction between the tyre and the road surface is 0.6. If the permissible shear stress is 32373 X 104Pa. Determine the maximum shaft diameter. Assuming that the load is nearly torsional. What is maximum load permissible on each wheel?