Question

Sushant has a vessel, of the form of an inverted cone, open at the top, of height 11 cm and radius of top as 2.5 cm and is full of water. Metallic spherical balls each of diameter 0.5 cm are put in the vessel due to which $(\frac{2}{5})^{th}$ of the water in the vessel flows out. Find how many balls were put in the vessel. Sushant made the arrangement so that the water that flows out irrigates the flower beds. What value has been shown by Sushant?

Answer 1

Answer:

The number of spherical balls put in the vessel is 440.

Step-by-step explanation:

Given :  

Height (h) of the conical vessel = 11 cm

Radius (R) of the conical vessel = 2.5 cm

Diameter of the metallic spherical balls

Radius (r) of the metallic spherical balls = 0.5/ 2 = 0.25 cm

Let the number of spherical balls put in the vessel is  'n'.

Volume of the water flows out of the vessel = Total volume of the spherical balls dropped

2/5 × Volume of the cone = n × Volume of each spherical ball

2/5 × 1/3 πR²h = n × 4/3 πr³

R²h = n × 4 × 5/2 × r³

R²h = 10 n ×  r³

(2.5)² × 11 = 10 × n × (0.25)³

6.25 × 11 = 10 × n × 0.015625

n = (6.25 × 11) / (0.015625 × 10)

n = 68.75 / 0.15625

n = 440.

Hence, The number of spherical balls put in the vessel is 440.

The value shows by Sushant is the importance of conservation of water.

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Answer 2

Given that height

(h) of the conical vessel = 11 cm 

Radius (r1) of the conical vessel = 2.5

cm 

Radius (r2) of the metallic spherical balls = 0.52 = 0.25 cm 

Assume the number of spherical balls that were dropped in the vessel as 'n'.

 Volume of the water spilled out of the vessel = Total volume of the spherical balls dropped 25 × Volume of the cone = n × Volume of each spherical ball 

⇒25 × 1/3 πr12h = n × 4/3 πr23

 ⇒r12h

= n × 10r23

⇒ (2.5)2 × 11 = n × 10 × (0.25)3

 ⇒ 68.75 = 0.15625 n 

⇒ n = 440. 

∴The number of spherical balls that were dropped in the vessel is 440. Sushant made the arrangement so that the water that flows out, irrigates the flower beds. This shows the importance of conservation of water.