15. A hollow cylindrical copper pipe is 21 m long. Its outer and inner diameters are 10 cm and 6 cm
respectively. Find the mass of the copper used in making the pipe if mass of 1 cm³copper is about 9gram.
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ʜᴇʀᴇ ɪs ᴜʀ ᴀɴsᴡᴇʀ
ᴛʜɴx ᴘʟs
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nannaksbbeb snksbbdjnsjks
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