A right circular cone with radius R and height H contains a liquid which evaporates at a rate proportional to its surface area in contact with air (proportionality constant = k > 0). Find the time after which the cone is empty.
Given, liquid evaporates at a rate proportional to its surface area.
On substituting Eq. (iv) in Eq. (i), we get
. .. Required time after which the cone is empty, T = H/k
