Word problems

[rachelmaddie]

I need this checked please.

Let p denote the pressure exerted on the walls and t denote temperature of the gas.
The equation is given by
p = ct where c is the proportionality constant

Since the pressure is 6 pounds per square inch when the temperature is 440 degrees Fahrenheit.
—> 6 = 440c
—> 6/440 = 3/220

Then, the final equation to calculate pressure becomes:
p = 3/220t

Finally, the pressure exerted when the gas is 380 degrees Fahrenheit is given by:
p = 3/220 * 380 = 5.181818 = 5.18 pounds

 

[Dr.Peterson]

Finally, the pressure exerted when the gas is 380 degrees Fahrenheit is given by:
p = 3/220 * 380 = 5.181818 = 5.18 pounds

Looks good to me, as far as the problem they gave you is concerned -- except that the pressure is not in pounds.

I think the physics is all wrong, as pressure is not proportional to Fahrenheit temperature (do you get negative pressure when it's below zero?); but that's not your concern, unless they've told you that.

 

[rachelmaddie]

Looks good to me, as far as the problem they gave you is concerned -- except that the pressure is not in pounds.

I think the physics is all wrong, as pressure is not proportional to Fahrenheit temperature (do you get negative pressure when it's below zero?); but that's not your concern, unless they've told you that.

So should I remove pounds?

 

[Otis]

So should I remove pounds?

Hello. No. It's always good form to report units, when answering a word problem.

Use the same units as you did in your first post.

… 6 pounds per square inch …

?

 

[rachelmaddie]

Hello. No. It's always good form to report units, when answering a word problem.

Use the same units as you did in your first post.



?

So, 5.18 pounds per square inch?