Physics-
General
Easy

Question

In the figure shown, a person wants to raise a block lying on the ground to a height h. In both the cases if time required is same then in which case he has to exert more force. Assume pulleys and strings light.

  1. (i)    
  2. (ii)    
  3. same in both    
  4. Cannot be determined    

The correct answer is: (i)


    Since,blank h equals fraction numerator 1 over denominator 2 end fraction at2 Þ a should be same in both cases, because h and t are same in both cases as given.
    table row cell I n invisible function application left parenthesis i right parenthesis F subscript 1 end subscript minus m g equals m a. rightwards double arrow F subscript 1 end subscript equals m g plus m a end cell row cell text end text text ( end text text i end text text i end text text ) end text text end text 2 F subscript 2 end subscript minus m g equals m a rightwards double arrow F subscript 2 end subscript equals fraction numerator m g plus m a over denominator 2 end fraction end cell row cell text end text text I end text text n end text text end text end cell row cell therefore F subscript 1 end subscript greater than F subscript 2 end subscript end cell end table

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