Question

The surface area of the sphere is 2464 sq. cm. Find its radius.
Through a cylindrical tunnel of diameter, 21 meters of water flows uniformly at the rate of 18 km per hour. How much water will flow through it in 20
minutes

Answer 1

Answer:

Diameter of the cylindriacal tunnel=21m

∴ Radius=r=

2

21

m

Speed of water=18kmph=1800m/hr

Volume of flowing water in 60 minutes=πr

2

h

=

7

22

×

2

21

×

2

21

×18000

Volume of flowing water in 20 minutes=πr

2

h

=

7

22

×

2

21

×

2

21

×18000×

60

20

=2079000cu.cm

∴ Volume of flowing water in 20 minutes=2079000cu.cm

Answer 2

2079000

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