Math, asked by bkalhdo, 11 months ago

एक घन का आयतन 8 cm³ / s की दर से बढ़ रहा है पृष्ठ क्षेत्रफल किस दर से बढ़ रहा है जबकि इसके किनारे की लंबाई 12 cm है ​

Answers

Answered by naushad55
5

it's answer is 4cm^3/sec

Attachments:
Answered by erinna
0

The surface area increased at the rate of 8/3 cm³ / s.

Step-by-step explanation:

The volume of a cube increased at the rate of 8 cm³ / s.

\dfrac{dV}{dt}=8

Volume of a cube is

V=a^3

where, a is side length.

Differentiate with respect to t.

\dfrac{dV}{dt}=3a^2\dfrac{da}{dt}

Substitute \dfrac{dV}{dt}=8 and a=12 in the above equation.

8=3(12)^2\dfrac{da}{dt}

8=432\dfrac{da}{dt}

Divide both sides by 432.

\dfrac{8}{432}=\dfrac{da}{dt}

\dfrac{1}{54}=\dfrac{da}{dt}

The surface area of cube is

A=6a^2

Differentiate with respect to t.

\dfrac{dA}{dt}=12a\dfrac{da}{dt}

Substitute \dfrac{da}{dt}=\dfrac{1}{54} and a=12 in the above equation.

\dfrac{dA}{dt}=12(12)(\dfrac{1}{54})

\dfrac{dA}{dt}=\dfrac{8}{3}

Therefore, the surface area increased at the rate of 8/3 cm³ / s.

#Learn more

एक वृत्त की त्रिज्या समान रूप से 3 cm/s की दर से बढ़ रही है । ज्ञात कीजिए कि वृत्त का क्षेत्रफल किस दर से बढ़ रहा है जब त्रिज्या | 10 cm है ​

https://brainly.in/question/9851054

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