Volume of Sphere
Volume of A Sphere
Volume of A Sphere: The volume V of a sphere of radius r is given by
Illustration: Find the volume of a sphere of radius 7cm.
Solution: We know that the volume V of a sphere of radius r is given by
Illustration: A solid lead ball of radius 7 cm was melted and then drawn into a wire of diameter 0.2 cm. Find the length of the wire.
Solution: We have,
Radius of the lead ball = 7 cm
As the ball is spherical, Volume of the lead ball
So, Volume of the lead ball
Clearly, the wire is a cylinder of radius 0.1 cm.
Let the length of the wire be h cm. Then,
Volume of the wlre
Volume of the wlre
But, Volume of the wire = Volume of the lead ball
Hence, the length of the wire = 457.33 m
Illustration: A solid sphere of radius 1 cm is melted to stretch into a wire of length 100 cm. Find the radius of the wire.
Solution: We have,
The curved surface area of a sphere is 1386 sq .cm. Its volume is ___________________ | |||
| Right Option : C | |||
| View Explanation | |||
A solid sphere of radius 3 cm is melted and then cast into small spherical balls each of diameter 0.6 cm. Find the number of balls thus obtained. | |||
| Right Option : C | |||
| View Explanation | |||
Find the volume of the sphere of radius 0.7 cm. | |||
| Right Option : B | |||
| View Explanation | |||
Students / Parents Reviews [10]
A marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
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Manish Kumar
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Prisha Gupta
8thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
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8thIt was a good experience with Abhyas Academy. I even faced problems in starting but slowly and steadily overcomed. Especially reasoning classes helped me a lot.
