To pull a 30 kg crate across a horizontal frictionless floor, a worker applies a force of 190 N, directed 20° above the horizontal. The crate moves 3.0 m. (a) What work is done on the crate by the worker's force? (b) What work is done on the crate by its own weight? (c) What work is done on the crate by the normal force exerted by the floor on the crate? (d) What is the total work done on the crate?