Question

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
11​

Answer 1

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