Two workers are moving a crate with a mass of 100 kg at constant speed across a horizontal floor. Worker 1 uses a rope to pull on the crate with a force of 80 N at an angle of 24° with respect to the horizontal. Worker 2 pushes on the crate with a force of 110 N at an angle of 46° with respect to the horizontal. 

(a) What is the normal force applied by the surface on the crate?

(b) What is the coefficient of kinetic friction between the floor and the crate?