16. A cylindrical road roller made of iron is 1 m long. Its internal diameter is 54 cm and the
thickness of the iron sheet used in making the roller is 9 cm. Find the mass of the roller,
if 1 cm? of iron has 7.8 gm mass. (Use ti = 3.14)
17. A vessel in the form of a hollow hemisphere moi
Ibrah11
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Answer:
Given, inner diameter of road roller =54cm and its thickness is 9cm.
So, internal radius (r)=27cm and outer radius (R)=27cm+9cm=36cm
Length or height of the roller =1m=100cm
So, volume of the cylinder =π(R
2
−r
2
)h=
7
22
×(36
2
−27
2
)100=178200cm
3
Now, it is given that 1cm
3
of iron weighs 8g.
Therefore, weight of the pipe =178200×8g=1425600g=1425.6kg
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