A solid copper wire of surface area 1386 cm sq. is melted to drawn into a wire of uniform cross section. if length of the wire is 31.5 m. Find the diameter of wire.
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given that solid copper wire is melted into a wire of uniform cross section.
therefore,diameter of solid copper wire is equals to diameter of casted wire.
therefore their radius are same.
volume of solid copper wire =volume of casted wire
Πr^2h=Πr^2h1
h=h1
therefore their heights are also same.
surface area of solid copper wire=1386/100
2Πrh=1386/100
2×22/7×r×31.5=1386/100
r=(693×7)/(22×31.5×100)
r=0.07m
I hope it is correct
therefore,diameter of solid copper wire is equals to diameter of casted wire.
therefore their radius are same.
volume of solid copper wire =volume of casted wire
Πr^2h=Πr^2h1
h=h1
therefore their heights are also same.
surface area of solid copper wire=1386/100
2Πrh=1386/100
2×22/7×r×31.5=1386/100
r=(693×7)/(22×31.5×100)
r=0.07m
I hope it is correct
prajapatyk:
just a minute frnds
i will correct it
a small mistake
hey how do u know the surface area is curved or total
when a paper is used to make a conical shape its base get neglected in the same way when copper is used to make a wire its base get neglected,that is why i selected csa
i'm very much thankful for all your efforts !! n i apologize cuz i made a mistake writing question sorry
it is a copper sphere having sa
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