Question

A block rests on a rough inclined plane making an angle of 300 with the horizontal. the coefficient of static friction between the block and the plane is 0.8. if the frictional force on the block is 10 n, the mass of the block in kg is:

Answer 1

see dear, here normal force N= mg cos $30^{0}$

and we know that frictional force

$F_{c}$=μN

$F_{c}$=10=0.8 m*10*$\sqrt[]{3}$/2

solving we get

m=5/2$\sqrt[]{3}$=1.44