Any help/hints with this would be greatly appreaciated: Lisa runs up 4 flights o

Question

Any help/hints with this would be greatly appreaciated: Lisa runs up 4 flights of stairs in 22s She weighs 510N. Ifeach flight rises 3.1m: a) what is her change in potential? b) what average power was required during the 22s? c) what would be the minimun hp required? Thanks! Any help/hints with this would be greatly appreaciated: Lisa runs up 4 flights of stairs in 22s She weighs 510N. Ifeach flight rises 3.1m: a) what is her change in potential? b) what average power was required during the 22s? c) what would be the minimun hp required? Thanks!

Explanation / Answer

   a.   Total heightgained   h   =   4 *3.1   =   12.4   m          P.E.   =   m* g * h   =   510 *12.4                  (m*g   =   weight   =   510   N)          P.E.   =   6324.0   J    b.   Power   P   =   Workdone / time   =   P.E. gained /t   =   6324.0 /22   =   287.45   W    c.   Power inhp   =   power in watt /746   =   0.385   hp    

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