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ICSE Class 10 Answered

ch. work power energy
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Asked by nilesh.dhote74 | 27 Apr, 2020, 05:58: PM
answered-by-expert Expert Answer

Work done in raising a 500kg mass to a height of 80m against the force of gravity is:

(a)W = mg x h= mgh

W= 500 x 10 x80 =4 x105J

 b right parenthesis P o w e r space a t space w h i c h space p u m p space w o r k s space equals space fraction numerator W o r k over denominator t i m e space t a k e n end fraction space equals space fraction numerator m g h over denominator t end fraction space equals space fraction numerator 50 cross times 10 cross times 80 over denominator 10 end fraction space equals space fraction numerator 4 cross times 10 to the power of 5 over denominator 10 end fraction space equals 40000 space W equals space space 40 space k W space c right parenthesis space E f f i c i e n c y space equals space fraction numerator u s e f u l space p o w e r space over denominator p o w e r space i n p u t end fraction space E f f i c i e n c y space equals space 40 space percent sign space equals space 40 divided by 100 space equals space 0.4 T h u s comma space 0.4 equals fraction numerator 40000 over denominator p o w e r space i n p u t end fraction space P o w e r space i n p u t space space equals space fraction numerator 40000 over denominator 0.4 end fraction equals space 100000 space W equals space 100 space k W space
Answered by Shiwani Sawant | 27 Apr, 2020, 06:59: PM

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