Question

Use differentials to estimate the amount of paint needed to apply a 1/4 cms thick coat of paint to a sphere having diameter 4 cms.

Answer 1

hmmm,

Answer 2

The volume of a sphere of radius r is 4/3pi r^3
. Thus we have the dierential dV = 4pi*r^2dr Remember that
dV approximates the change in the volume of the sphere as its radius increases from
r to r + dr.

Answer 3

how did you get 4/3pi r^3?

Answer 4

thats the volume of a sphere, look it up

Answer 5

why were my answers deleted?

Answer 6

sometimes the website crashes

Answer 7

you can copy and paste your solution before submitting it .

Answer 8

yes its very frustrating,