Question
Mon March 09, 2015 By: Dev

you are given a sphere of radius 2 cm. if you are asked to select a best suited spring balance to determine its weight, then that what should be the range sna least count of the spring balance.(the sphere is made of an alloy of density 7you are given a sphere of radius 2 cm, Question no 89123, Physics

Expert Reply
Priyanka Kumbhar
Mon March 09, 2015
begin mathsize 12px style Given colon Radius space of space the space sphere comma space straight r space equals space 2 space cm space equals space 0.02 space straight m Density space of space alloy comma space straight d space equals space 7 space cross times space 10 cubed space kg space straight m to the power of negative 3 end exponent density space equals space mass over volume mass comma space straight m space equals space density space cross times space volume space equals space 7 space cross times space 10 cubed space cross times space 4 over 3 πr cubed straight m space equals space space 7 space cross times space 10 cubed space cross times space 4 over 3 space cross times space 3.14 space cross times space left parenthesis 0.02 right parenthesis cubed straight m space equals space 234.43 space cross times space 10 to the power of negative 3 end exponent space kg space equals space 234.34 space gm weight space of space sphere comma space straight W space equals space mg space equals space 234.34 space gwt end style
We can take the range of the weight around 0-250 gwt. So if we consider a balance spring balance with this range its least count will be 2.5 gwt
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