Boxes are transported from one location to another in a warehouse by means of a

Question

Boxes are transported from one location to another in a warehouse by means of a conveyor belt that moves with a constant speed of 0.40 m/s. At a certain location the conveyor belt moves for 2.0 m up an incline that makes an angle of 8

Explanation / Answer

a) as the box moves up, the work being done is against gravity : W = F*dr --> mgsin8*2 that will give u work.. now rate of work, u need time so : t = d/V ... 2/0.4 = 5s hence answer for a is -mgsin8*2 /5 --> (-mgsin8*2)/5 .. minus sign indicates work against gravity. b) horizontal movement means 0 work, since the box isnt moving against gravity. c) mgsin8*2/ 5 .. no minus sign

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