Year 12s: what will be the first way you research your future options? >>

Forums
C3 quick question

This discussion is now closed.

Check out other Related discussions

Isaac physics SPC 2022
Senior Physics Challenge Isaac Physics
Isaac Senior Physics Challenge 2024
Senior Physics Challenge 2022
best way to revise maths
Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]
Physics Question help
A-Level Music Technology 2023
Excel - urgent help!!
Alevel physics
How did your exams go?
History of Art A Level Help!
Famous Hungarians
A-level Maths Papers (Edexcel)
C3
how to get As and A+ in exams
Maths Trig question
Who's applied for Endcliffe accommodation 2023?
Learning books for 1st year of medicine
is seneca good for cramming for exams?

C3 quick question

The radius of a circular disc is increasing at a constant rate of 0.003cm s-1. Find the rate at which the area is increasing when the radius is 20.

thank you!

please reply asap!

Reply 1

.:HYBRID:.

A=πr^2
dA/dr=2 πr
dr/dt=0.003
dA/dt=dr/dt x dA/dr = 0.006 πr
r=20
dA/dt=3π/25=0.377...

thank you

why 3 pie/25?where is it from?

0,377 why

MCYan

0,377 why

0.006 times Pi times r, with r being 20??

Related discussions

Isaac physics SPC 2022
Senior Physics Challenge Isaac Physics
Isaac Senior Physics Challenge 2024
Senior Physics Challenge 2022
best way to revise maths
Edexcel A2 Mathematics: Core Mathematics C4 6666 01 - 22 June 2018 [Exam Discussion]
Physics Question help
A-Level Music Technology 2023
Excel - urgent help!!
Alevel physics
How did your exams go?
History of Art A Level Help!
Famous Hungarians
A-level Maths Papers (Edexcel)
C3
how to get As and A+ in exams
Maths Trig question
Who's applied for Endcliffe accommodation 2023?
Learning books for 1st year of medicine
is seneca good for cramming for exams?