The radius of a friction circle for a shaft rotating inside a bearing is (where

Question

The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$ = Coefficient of friction between the shaft and bearing)

Options:

A . $${\text{r}}\sin \varphi $$

B . $${\text{r}}\cos \varphi $$

C . $${\text{r}}\tan \varphi $$

D . $$\frac{{\text{r}}}{2}\cos \varphi $$

Answer: Option A

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