Related rates help

  • Thread starter sammiyahc0
  • Start date
  • #1
1. Assume that the radius r of a sphere is expanding at a rate of 50 cm/min. The volume of a sphere is V= 4/3 πr^3 and its surface area is 4πr^2.Determine the rate of change of volume when r = 13 cm



2. I tried d/dr=8*13*50*pi



3. 5200pi but is wrong
 

Answers and Replies

  • #2
haruspex
Science Advisor
Homework Helper
Insights Author
Gold Member
2020 Award
35,581
6,450
Pls post your reasoning/working to obtain that expression for (I presume you meant) dV/dr.
 

Related Threads on Related rates help

  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
7
Views
4K
  • Last Post
Replies
0
Views
1K
  • Last Post
Replies
1
Views
5K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
5
Views
656
  • Last Post
Replies
9
Views
5K
  • Last Post
Replies
5
Views
2K
  • Last Post
Replies
3
Views
2K
Top