3. The external radius of a 14-cm-long metallic pipe is 9 cm. and the pipe is l cm thick find
the volume of the mctal used in the pipe, If the mass of 1 cm metal is 8.5 g, find the
of the pipe
thick. Find
find the mass
Answers
Step-by-step explanation:
The volume and mass of pipe is and 6.49 kg respectively.
Step-by-step explanation:
Given The external radius of a 14 cm long metallic pipe is 9 cm and the pipe is 1 cm thick. we have to find the volume and also the mass of metallic pipe if the mass of 1 cm cube metal is 8.5 gram.
External radius=14 cm
Internal radius=External radius - thickness=14-1=13 cm
Volume of metal pipe=
=
=
=
=
The mass of metal is 8.5 gram
∴ The mass of metal is
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Question :
The external radius of a 14 cm long metallic pipe is 9 cm , and the pipe is 1 cm thick . Find the volume of the metal used in the pipe if the mass of 1 cm³ metal is 8.5 gram . Find the mass of the pipe.
Answer :
External radius = 9 cm
Internal radius = ( external radius) - ( thickness )
= (9-1) cm
= 8 cm
Volume of metal in pipe= πh(R²- r²)
= 22/7×14×(81-64)
= 22/7×14×17
= 22×4×17
= 44×17
= 748 cm³
Given,
Mass of 1 cm³ metal=8.5g
Therefore,
Mass of 748 cm³ metal= 8.5×748
= 6.358g
