Question

A spherical glass vessel has a cylindrical neck 8cm long, 2cm in diameter, the diameter of the spherical part is 8.5 cm. Find the volume of the vessel.
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Answer 1

Answer:

A spherical mirror is a mirror which has the shape of a piece cut out of a spherical surface. There are two types of spherical mirrors: concave, and convex. These are illustrated in Fig. 68. The most commonly occurring examples of concave mirrors are shaving mirrors and makeup mirrors.

Answer 2

$\textrm{Volume of vessel = Volume of sphere + Volume of cylinder}$

$\longrightarrow\rm{Volume\: of\: vessel = 4/3\pi r^3+ \pi r^2h=[4/3\times\pi\times r^3]+ [\pi \times r^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=[4/3\times 3.14\times r^3]+ [3.14\times r^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=[4/3\times 3.14\times (Diameter/2)^3]+ [3.14\times (Diameter/2)^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=[4/3\times 3.14\times (8.5/2)^3\:cm^3]+ [3.14\times (2/2)^2\:cm^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=[4/3\times 3.14\times (4.25)^3\:cm^3]+ [3.14\times (1)^2\:cm^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=[4/3\times 3.14\times (4.25)^3\:cm^3]+ [3.14\:cm^2\times h]}$

$\longrightarrow\rm{Volume\: of\: vessel=321.39\:cm^3+ [3.14\:cm^2\times 8\:cm]}$

$\longrightarrow\rm{Volume\: of\: vessel=321.39\:cm^3+25.12\:cm^3=346.51\:cm^3}$

$\boxed{\textrm{Hence we can say that, The child is not correct}}$