Application of Derivatives 2 Question 1
1. A spherical iron ball of radius
(2019 Main, 10 April II)
(a)
(b)
(c)
(d)
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Solution:
- Let the thickness of layer of ice is
On differentiating Eq. (i) w.r.t. ’
[-ve sign indicate that volume is decreasing as time passes].
At
So, the thickness of the ice decreases at the rate of
