An electric sander has a continuous belt that rubs against a wooden surface as shown schematically in figure. The sander is 40% percent efficient and drawns a power of 1200 W. The belt speed is `8m//s`. If the sander is pushing against the wood with a normal force of 100 Newton, the coefficient of friction is `mu`, which is `10mu` ?

Answer

1

Explanation

For 2M `T_(2)-2Mg=0 " implies "2T_(1)=2Mg " "(becauseT_(2)=2T_(1)" for pulley")`
`implies " "T_(1)=Mg`
For M : `T_(1)-Mg sin theta- muMg costheta=0`
`implies " "Mg-Mg sin theta-muMg cos theta=0`
`implies " "sintheta+mucostheta=1`