What is the ratio of maximum tangential stress ($$\sigma_t$$) and maximum radial stress ($$\sigma_r$$) of a solid disk flywheel ?

A

$$\frac{\sigma_t}{\sigma_r}$$=0.5

B

$$\frac{\sigma_t}{\sigma_r}$$=1.0

C

$$\frac{\sigma_t}{\sigma_r}$$=1.5

D

$$\frac{\sigma_t}{\sigma_r}$$=2.0