if cos theta= 2M/1+M² then sec theta=
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EXPLANATION.
Water flows through a circular pipe.
Internal diameter = 2 cm.
Rate = 6m/sec into a circular tank.
The radius of whose base = 60 cm.
To find the rise in the level in water in 30 minutes.
As we know that,
Diameter = 2 x Radius.
Radius = Diameter/2.
Radius = 2/2 = 1 cm = 1/100 m.
Volume of cylinder = πr²h.
Volume of water flows through a circular pipe in 1 seconds = πr²h.
π x (1/100)² x 6.
The raise in the water level in 30 minutes = π x (1/100)² x 6 x 30 x 60.
Radius whose base = 60 cm = 60/100 m.
Volume = πr²h.
⇒ π x (60/100)² x h.
⇒ π x (60/100)² x h = π x (1/100)² x 6 x 30 x 60.
⇒ 60/100 x 60/100 x h = 1/100 x 1/100 x 6 x 30 x 60.
⇒ 60 x 60 x h = 6 x 30 x 60.
⇒ 60 x h = 6 x 30.
⇒ 10 x h = 30.
⇒ h = 3m.