> A hollow tube open at both ends is made of a metal and is 4cm thick. If the external radius is 40 cm and the length of the tube is 70 cm, find the volume of the metal used and the external curved surface area.
Answers
Answer:
Answer:
703.36 cubic cm
Step-by-step explanation:
Inner diameter = 10.4 cm
inner radius r = Diameter/2 =10.4/2 =5.2 cm
Thickness = 8 mm = 0.8 cm
Outer radius R = Inner radius +thickness = 5.2+0.8 = 6 cm
Height = 25 cm
Volume of metal used = Outer volume - inner volume
=\pi(R^2 -r^2)hπ(R
2
−r
2
)h
=3.14(6^2 -5.2^2)253.14(6
2
−5.2
2
)25
=703.36 cm^3703.36cm
3
Hence the volume of metal used is 703.36 cubic cm
Answer:
Answer:
703.36 cubic cm
Step-by-step explanation:
Inner diameter = 10.4 cm
inner radius r = Diameter/2 =10.4/2 =5.2 cm
Thickness = 8 mm = 0.8 cm
Outer radius R = Inner radius +thickness = 5.2+0.8 = 6 cm
Height = 25 cm
Volume of metal used = Outer volume - inner volume
=\pi(R^2 -r^2)hπ(R
2
−r
2
)h
=3.14(6^2 -5.2^2)253.14(6
2
−5.2
2
)25
=703.36 cm^3703.36cm
3
Hence the volume of metal used is 703.36 cubic cm
Step-by-step explanation: