How Do You Rearrange the Speed of Sound Equation to Solve for M in Gas?

Click For Summary
To rearrange the speed of sound equation for gas, start with v = sqrt[(gamma * R * T) / M]. Squaring both sides gives v² = (gamma * R * T) / M. Next, multiply both sides by M to get M * v² = gamma * R * T. Finally, divide both sides by v² to isolate M, resulting in M = (gamma * R * T) / v². This corrects the initial attempt and provides the proper formula for M.
cseet
Messages
40
Reaction score
0
Hi all,

can you pls show me how you rearrange the speed of sound in gas equation from the original equation of:

v (sound) = sqr of [(gamma * R * T) / M]

I would like to find M, I tried to rearrange it to the following:

M = sq of [(gamma * R * T) / v]

pls kindly correct me with these.

thanks
cseet
 
Physics news on Phys.org
cseet said:
Hi all,

can you pls show me how you rearrange the speed of sound in gas equation from the original equation of:

v (sound) = sqr of [(gamma * R * T) / M]

I would like to find M, I tried to rearrange it to the following:

square both sides (in algebra you try to treat each side the same way)

v2 = (gamma * R * T) / M

multiply each side by M (doing the same thing to RHS and LHS is fair)

M * v2 = (gamma * R * T)

divide both sides by v2

M = (gamma * R * T)/ v2
 
thanks marcus

thanks Marcus, you're a gem!
cseet
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

Similar threads

Replies
3
Views
1K
  • · Replies 13 ·
Replies
13
Views
1K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
3
Views
4K
Replies
7
Views
2K
Replies
2
Views
2K
Replies
5
Views
3K
  • · Replies 12 ·
Replies
12
Views
4K
  • · Replies 7 ·
Replies
7
Views
5K
  • · Replies 3 ·
Replies
3
Views
3K