a block of mass M rest on a rough horizontal surface . the coefficient of friction between the block and the surface is nu a force F= mg acting at angle theta with the vertical side of the block pulls it in which of the following cases the block can be pulled along the surface?
A)tan theta≥ nu B) cot theta ≥ nu C) tan theta/2 ≥ nu D) cot theta/3 ≥ nu
