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titansarus
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Homework Statement
Question from fundamental of physics, Halliday Resnick Walker
In Figure below, a ##m=0.250## kg block of cheese lies on the floor of a ##M=900 kg## elevator cab that is being pulled upward by a cable through distance ##d1 =2.40 m## and then through distance ##d2 = 10.5 m##. (a) Through d1, if the normal force on the block from the floor has constant magnitude ##F_N## = 3.00 N, how much work is done on the cab by the force from the cable? (b) Through d2,if the work done on the cab by the (constant) force from the cable is 92.61 kJ, what is the magnitude of ##F_N##?
Homework Equations
##W = F d## (in 1 dimension)
##\Sigma F = m a##
##\vec F_{12} = - \vec F_{21}##
3. The Attempt at a Solution
I don't have problem at the solution itself, My problem is with the solution of the book.
Answer of the book: