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 Use the same system described in problem 3, however now...

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Using a luff tackle (Figure 2-7 in the Dover text) with a mechanical advantage of 3, determine

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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.
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?

年 -19m 1.5 m