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(i) A stone is dropped into a quite lake and waves move in circles at the speed of 5 cm/s. At the instant when the radius of circular wave is 8cm, how fast is the enclosed area increasing?
cbse
class12
modelpaper
2012
sec-c
q28
math
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asked
Jan 23, 2013
by
thanvigandhi_1
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A stone is dropped into a quiet lake and waves move in circles at the speed of $5 \;cm/s$. At the instant when the radius of the circular wave is $8 \;cm$, how fast is the enclosed area increasing?
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The volume of a cube is increasing at the rate of \( 8cm^ 3/s\) . How fast is the volume of a cube is increasing at the rate of \(8cm^ 3 /s\) . How fast is the surface area increasing when the length of an edge is $12 cm$?
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If a young man rides his motorcycle at 25 km/hour, he had to spend Rs.2 per km on petrol. If he rides at a faster speed of 40 km/hour, the petrol cost increases at Rs.5 per km. He has Rs.100 to spend on petrol and wishes to find what is the maximum distance he can travel within one hour. Express this as L.P.P. and solve it graphically.
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Calculate the area of the region enclosed between the circles \( x^2+y^2=9 \: and \: (x-3)^2+y^2=9.\)
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Jan 21, 2013
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Using integration, find the area of region enclosed between the circles \( x^2+y^2=4 \: and \: (x-2)^2+y^2=4.\)
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