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A metallic disc is being heated. Its are...

A metallic disc is being heated. Its area (in `m^(2)`) at any time t (in sec) is given by `A=5t^(2)+4t`. Calculate the rate of increase in area at `t=3sec`.

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The correct Answer is:
`34m^(2)//sec`
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ALLEN -RACE-Basic Maths (Differentiation)
  1. If y=e^(x)sin x, then find (dy)/(dx)

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  2. Position of particle moving along x-axis is given as x=2+5t+7t^(2) the...

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  3. A metallic disc is being heated. Its area (in m^(2)) at any time t (in...

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  4. If the velocity of a paraticle moving along x-axis is given as v=(4t^(...

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  5. The displacement x of particle moving in one dimension, under the acti...

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  6. A car moves along a straight line whose equation of motion is given by...

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  7. A particle moves along X-axis in such a way that its coordinate X vari...

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  8. Relation between displacement x and time t is x=2-5t+6t^(2), the initi...

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  9. The displacement 'x' of a particle moving along a straight line at tim...

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  10. If the distance covered by a particle is given by the relation x=at^(2...

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  11. The displacement of a particle is given by x=a(0)+(a(1)t)/(3)-(a(2)t...

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  12. If y=(x^(2))/((x+1))"then"(dy)/(dx)"is":-

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  13. If v=(t+2)(t+3) then acceleration(i.e(dv)/(dt)) at t=1 sec.

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  14. If y=log(e)x+sinx+e^(x)" then "(dy)/(dx) is

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  15. (d)/(dx)(e^(100))=…………………

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  16. (d)/(dx)(sin120^(@))=…………

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  17. If y=x^(3)cosx" then "(dy)/(dx)=……………………

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  18. If v=(t^(2)-4t+10^(5))m/s where t is in second. Find acceleration at t...

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  19. If y=sinx+cosx" then "(d^(2)y)/(dx^(2)) is :-

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  20. If xpropt^(5//2) then

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