2. Using a luff tackle (Figure 2-7 in the Dover text) with a mechanical advantage of 3, determine the effort (in N), work (in J), and power (in W) required to lift a 2000 Newton crate a distance of 50 cm in 30 seconds. Assume a frictionless system.

3. Use the same system described in problem 3, however now there is a frictional loss of 100 N-m. What is the efficiency of the system? 

                 

19 m OJ1.5 m