(a) A body of weight 45 N is placed on a rough horizontal plane. To just move the body on the horizontal plane, a push of 30 N inclined at 11° to the horizontal plane is required. Find the coefficient...

Extracted text: (a) A body of weight 45 N is placed on a rough horizontal plane. To just move the body on the horizontal plane, a push of 30 N inclined at 11° to the horizontal plane is required. Find the coefficient of friction. (b) Determine the number of members in a structure, if the total number of joints in the structure is 6.