Review question

# Can we track this constantly growing patch of fluid? Add to your resource collection Remove from your resource collection Add notes to this resource View your notes for this resource

Ref: R6959

## Question

A viscous liquid is poured on a flat surface. It forms a circular patch which grows at a steady rate of $\quantity{5}{cm^2/s}$. Find, in terms of $\pi$,

1. the radius of the patch 20 seconds after pouring has commenced.
2. the rate of increase of the radius at this instant.