(This is a continuation of HW#6 Problem #11. Unfortunately, you will have to use

Question

(This is a continuation of HW#6 Problem #11. Unfortunately, you will have to use different numbers than last time, since there is no way for WebAssign to carry over the values you were assigned last time.) A man lifts a 17 kg crate directly upwards from the floor to a shelf (9 m high) at constant speed*. (*Neglect the very start and very end of the lift, where the crate would of course need to be accelerated from/to rest.) a.)-d.) You did these parts last week. d.) What was the change in kinetic energy of the crate? (this part overlaps with the last HW, but will get you started here!) J e.) What is the change in the potential energy of the crate? J f.) Is mechanical energy conserved in this process? (Make sure you understand why.) no yes g.) Is the force the man exerts a conservative force? (Make sure you understand why.) yes no h.) If it takes 3 s for the man to lift the crate to the shelf, find the man's power output. W

Explanation / Answer

d) change in kinetic energy of the crate= 0 Joule

e) change in the potential energy of the crate= mgH = 1500.93 Joule
f) mechanical energyis always conserved
g) force the man exerts a non conservative force

h) Velocity= 9/3= 3 m/sec

Power = F*V= M*g*V= 500.31 Watt

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