Answer Happy

Exercises For the exercises in this chapter (and subsequent chapters), use the more accurate value of g = 9.8 m/s² for the acceleration due to gravity. El. A horizontally directed force of 40 N is used to pull a box a distance of 1.5 m across a tabletop. How much work is done by the 40-N force? E2. A woman does 210 J of work to move a table 1.4 m across the floor. What is the magnitude of the force that the woman applied to the table if this force is applied in the horizontal direction? E3. A force of 80 N used to push a chair across a room does 320 J of work. How far does the chair move in this process? E4. A rope applies a horizontal force of 180 N to pull a crate a distance of 2 m across the floor. A frictional force of 70 N opposes this motion. a. What is the work done by the force applied by the rope? b. What is the work done by the frictional force? c. What is the total work done on the crate? ES. A force of 130 N is used to drag a crate 4 m across a floor. The force is directed at an angle upward from the crate, so that the vertical component of the force is 120 N and the horizontal component is 50 N, as shown in the diagram. a. What is the work done by the horizontal component of the force? b. What is the work done by the vertical component of the force? c. What is the total work done by the 130-N force? 120 N! 130 N 50 N 4 m E5 Diagram