• Support PF! Buy your school textbooks, materials and every day products Here!

Weather balloon problem

  • #1
161
1

Homework Statement



assume the balloon is a spherical shape whose radius is 2.5m and total mass of 15 kg

a) what is the initial upward acceleration of the ballon when it is released from sea level


Homework Equations





The Attempt at a Solution



i know the volume of a sphere is =4/3 (pi)r3
so can calculate the volume
i know the density of the balloon is

p=m/v
and that the buoyancy is going to be greater than the weight
i reaaranged the equation and substituted m=pv into fb=ma

to get fb=pva

but i dont think this is the right way to do it
where am i going wrong and how do i finish the equation?

cheers
 

Answers and Replies

  • #2
161
1
please?
 
  • #3
3
0
i had a similar problem i solved for the force then the volume and manipulated the equation to read a=f/pv i got a reasonable answer
 
  • #4
161
1
ye i got the answer in the end. the acceleration comes out as about 42 m/s^2 but the next part of the question was to find where it reaches terminal velocity and it reaches it at 3m/s^2
 

Related Threads for: Weather balloon problem

  • Last Post
Replies
4
Views
4K
  • Last Post
Replies
3
Views
4K
  • Last Post
Replies
4
Views
16K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
10
Views
7K
Replies
1
Views
2K
Replies
1
Views
1K
  • Last Post
Replies
2
Views
6K
Top