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ICSE Class 10 Answered

ex. 3b numerical 10
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Asked by nilesh.dhote74 | 17 May, 2020, 10:15: AM
answered-by-expert Expert Answer

The labelled diagram of the block and tackle with a velocity ratio 3 is as shown, the total number of pulley is 3. 

  

 
a) 
V R space equals space 3 space V R thin space equals space n space equals space 3 E f f i c i e n c y space o f space t h e space s y s t e m comma eta space equals space 60 percent sign space space T h u s comma space M e c h a n i c a l space a d v a n t a g e space equals space V R space cross times eta equals 60 over 100 cross times 3 space equals space 1.8 space M a n space c a n space l i f t space l o a d space w i t h space e f f o r t space equals space 200 space k g f space T h u s comma space L o a d space equals space M A thin space cross times space e f f o r t space equals space 1.8 space cross times 200 space equals space 360 space k g f space 
 
b)  if effort end moves a distance 60 cm,what distance does the load move
 
V R space equals space fraction numerator D i s tan c e space o f space e f f o r t space open parentheses d subscript E close parentheses over denominator D i s tan c e space o f space l o a d open parentheses space d subscript L close parentheses end fraction space T h u s comma space D i s tan c e space o f space l o a d open parentheses space d subscript L close parentheses equals space 60 over 3 space equals space space 20 space c m space

Answered by Shiwani Sawant | 17 May, 2020, 01:35: PM

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