Convert horsepower to Joule... show every step

و (a) OC. (c) D. (d) (b) کانا (d) ( Which one of the graphs in the image above represents the dependence of the twist-angle on the length / of a solid rod of radius r, when the torque causing the twist is the same for all lengths? O A. (a) O B. (b)

1. Calculate the stress set up in a thin flywheel rim,one meter in diameter,made of steel density 7.86g/cm³,when rotating at 1500rev/min.

In terms of flexural stress, why do we need to use the Ix and ly and when will it be use? Explain and draw some diagrams. While designing, the determination of dimension must be the larger or the smaller one? Why? In knowing capacity, both in terms of load or stress, should it be the larger or the smaller ones? Why?