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The following question has been closed with the explanation that it is in breach of the Homework Policy :
What will be the total work done by friction on the system (man+boat)?
However, it is not asking for a calculation nor is it asking someone to "do my homework".
It is clearly asking for a ...
From my book,
Consider a centripetal force is applying on a object:
$$\vec{F}=f(r)\hat{r}$$
The torque for a particular point is,
$$\vec{N}=\vec{r}\times\vec{F}=\vec{r}\times{f(r)\hat{r}}$$
$$\vec{N}=r\hat{r}\times{f(r)\hat{r}}$$
$$\vec{N}=rf(r)(\hat{r}\times\hat{r})=\vec{0}$$
So the angul...
