Bookworm
Classical Mechanics
Level
2
There are three books on a shelf , volumes 1,2 and 3 . Each book is 24mm thick , comprising 2cm thickness of pages , and 2mm for each cover . A bookworm eats its way from page 1 of volume 1 , to the last page of volume 3. How far does it travel?(in mm)
16
28
64
36
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1 solution
Actually the first volume is put just upside down over the second and the third volume is also in the same way. Thus total distance traversed= End cover of 1st+total thickness of 2nd+ first cover of third. =2+24+2 =28! Ans.