Work done in blowing a bubble of radius r is w.Then work done in blowing a bubble of radius 2r=?
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As volume of the bubble,
V=43πR3V=43πR3
Thus, R2α V2/3R2α V2/3
W=8πR2T⇒Wα R2 α V23W=8πR2T⇒Wα R2 α V23
W2W1=(V2V1)2/3=(2VV)2/3W2W1=V2V12/3=2VV2/3= 222/3=441/3
⇒W2=3√4W⇒W2=43W Ans.
V=43πR3V=43πR3
Thus, R2α V2/3R2α V2/3
W=8πR2T⇒Wα R2 α V23W=8πR2T⇒Wα R2 α V23
W2W1=(V2V1)2/3=(2VV)2/3W2W1=V2V12/3=2VV2/3= 222/3=441/3
⇒W2=3√4W⇒W2=43W Ans.
anujana:
no
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volume of cylinder=4/3pi r^3
if radius is r then work done is w
if radius is 2r then work done is equal to 8r
if radius is r then work done is w
if radius is 2r then work done is equal to 8r
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