A worker wishes to pile up sand on to a circular area of radius `R`. No sand is to spill on to the surrounding area. If `mu_(s)` is the coefficient of static friction sand particles, then choose the correct statement (s)

A worker wishes to pile up sand on to a circular area of radius R. No sand is to spill on to the surrounding area. If mu_(s) is the coefficient of static friction of sand on sand,the sand pile . Density of sand =rho

A worker wishes to pile a cone of sand onto a circular area in his yard. The radius of the circle is r,and no sand is to spill on to the surrounding area. If mu is the static coefficient of friction between each layer of sand along the slope and the sand, show that the greatest volume of sand that can be stored in this manner is (1)/(3) pi muR^(3) .

A ring of mass M and radius R sliding with a velocity v_(0) suddenly enters inthrough surface where the coefficient of friction is mu , as shown in figure. . Choose the correct statement (s).

A ring of mass M and radius R sliding with a velocity v_(0) suddenly enters inthrough surface where the coefficient of friction is mu , as shown in figure. . Choose the correct statement (s).

A ring of mass M and radius R sliding with a velocity v_(0) suddenly enters inthrough surface where the coefficient of friction is mu , as shown in figure. . Choose the correct statement (s).

A ring of mass M and radius R sliding with a velocity v_(0) suddenly enters inthrough surface where the coefficient of friction is mu , as shown in figure. . Choose the correct statement (s).

If coefficient of static friction is mu_(s) and coefficient of kinetic friction is mu_(k) , which one is correct ?

If mu_(s), mu_(k) and mu_(r) are the coefficients of static, kinetic and rolling friction respectively then