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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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Jan 23, 2013
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thanvigandhi_1
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0
votes
1
answer
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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Nov 22, 2012
by
thanvigandhi_1
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Sand is pouring from a pipe at the rate of \( 12 cm^3/s.\) The falling sand forms a cone on the ground in such a way that the height of the cone is always one-sixth of the radius of the base. How fast is the height of the sand cone increasing when the height is 4 cm?
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Feb 4, 2013
by
thanvigandhi_1
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sec-b
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The surface area of a spherical bubble of water increasing at the rate of \( 2 \: cm^2/sec.\) Find the rate at which the volume of the water bubble is increasing at that instant when its radius is 6 cm.
asked
Jan 30, 2013
by
thanvigandhi_1
cbse
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0
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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 $12 cm$?
asked
Nov 16, 2012
by
kasturi.c
cbse
class12
bookproblem
ch6
sec1
q2
p197
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easy
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0
votes
1
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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.
asked
Jan 27, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q28
math
0
votes
0
answers
Calculate the area of the region enclosed between the circles \( x^2+y^2=9 \: and \: (x-3)^2+y^2=9.\)
asked
Jan 21, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q25
math
0
votes
0
answers
Using integration, find the area of region enclosed between the circles \( x^2+y^2=4 \: and \: (x-2)^2+y^2=4.\)
asked
Jan 3, 2013
by
thanvigandhi_1
cbse
class12
modelpaper
2012
sec-c
q26
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