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CBSE Class 12-science Answered

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Asked by saisidh05 | 04 Jul, 2022, 03:04: PM
answered-by-expert Expert Answer
Let x be the side and A be the area of an equilateral triangle.
rightwards double arrow straight A equals fraction numerator square root of 3 over denominator 4 end fraction straight x squared space space space... space left parenthesis straight i right parenthesis rightwards double arrow dA over dt equals fraction numerator square root of 3 over denominator 4 end fraction cross times 2 straight x cross times dx over dt space space space space space space... space left parenthesis ii right parenthesis Since comma space dA over dt equals 4 space sq space cm space and space straight A equals 4 square root of 3 space sq space cm When space straight A space equals space 4 square root of 3 space sq space cm space rightwards double arrow space 4 square root of 3 equals fraction numerator square root of 3 over denominator 4 end fraction straight x squared space space space space space space space space space... space From space left parenthesis straight i right parenthesis rightwards double arrow straight x squared equals 16 space sq space cm rightwards double arrow straight x equals 4 space cm From space left parenthesis ii right parenthesis comma space we space get 4 space sq space cm equals fraction numerator square root of 3 over denominator 4 end fraction cross times 2 left parenthesis 4 right parenthesis space cm space cross times dx over dt rightwards double arrow dx over dt equals fraction numerator 16 over denominator 8 square root of 3 end fraction space cm rightwards double arrow dx over dt equals fraction numerator 2 over denominator square root of 3 end fraction space cm
Answered by Renu Varma | 07 Jul, 2022, 10:53: AM

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CBSE 12-science - Maths
pls provide solution
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Asked by saisidh05 | 04 Jul, 2022, 03:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 12-science - Maths
A ladder 17 metre long is leaning against the wall. The base of the ladder is pulled away from the wall at a rate of 5m/s. When the base of the ladder is 8 metres from the wall, i) How fast is the top of the ladder moving down the wall? ii) At what rate, the area of the triangle formed by the ladder, wall, and the floor, is changing ?
Asked by jeevasankar123456 | 17 Jul, 2020, 05:14: PM
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CBSE 12-science - Maths
Using differentials find the approx value Log e 10.02 given that loge 10 = 2.3026
Asked by haroonrashidgkp | 08 Sep, 2018, 04:22: PM
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CBSE 12-science - Maths
Using differentials find the approx value (27)1/3
Asked by haroonrashidgkp | 08 Sep, 2018, 04:18: PM
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CBSE 12-science - Maths
Find the value of left parenthesis 244 right parenthesis to the power of bevelled 2 over 5 end exponent approximately using differentials.
Asked by Topperlearning User | 05 Aug, 2014, 12:38: PM
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CBSE 12-science - Maths
The total revenue obtained by selling x units of a commodity is given by R(x) = 12x2 - 24x +19. Find the marginal revenue when x=17.
Asked by Topperlearning User | 05 Aug, 2014, 12:45: PM
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CBSE 12-science - Maths
Find the approximate value of f(4.02) where the function is given by f(x)=x3 - 3x2 + x + 2   
Asked by Topperlearning User | 05 Aug, 2014, 12:53: PM
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CBSE 12-science - Maths
A ladder, which is 13 m in length, is resting against a wall.  A man starts pulling the foot of the ladder away from the wall at the rate of 3 m/s.  Find the rate at which the top of the ladder is sliding when the foot of the ladder is 5 m away from the wall.
Asked by Topperlearning User | 05 Aug, 2014, 01:23: PM
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CBSE 12-science - Maths
Look at the conical funnel whose vertical angle is 90o. Water is dripping out from it at uniformly at the rate of 8 cm3/sec through a tiny hole at the vertex.  Find the rate at which the slant height of the water is decreasing when the slant height of the water is 4cm. Is leaking of water leads to wastage of water? Do you think we can afford to waste our natural resources?
Asked by Topperlearning User | 05 Aug, 2014, 01:35: PM
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CBSE 12-science - Maths
A girl whose height is 160 cm is walking with a speed of 4 m/min away from a lamppost, which is 6.4 m high. Now, her shadow is being formed which is increasing as she moves away. Find out the rate at which the shadow is increasing.
Asked by Topperlearning User | 05 Aug, 2014, 01:49: PM
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