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

But Pressure is Funner

  • Thread starter zcabral
  • Start date
  • #1
30
0
1. Homework Statement
An automobile tire is inflated with air originally at 10.0°C and normal atmospheric pressure. During the process, the air is compressed to 26.0% of its original volume and the temperature is increased to 32.0°C.
(a) What is the tire pressure?


2. Homework Equations

p1V1/t1=p2v2/t2

3. The Attempt at a Solution
i know this is simple but im just not getting the right answer I keep using p1V1/t1=p2v2/t2 but wrong answers come out. i used 1 atm for normal atmospheric pressure
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,744
12
Remember that T must be in Kelvin since you are dividing by it.
 
  • #3
30
0
yes it is in kelvin...i got 419903.5 is that right?
 
  • #4
mgb_phys
Science Advisor
Homework Helper
7,744
12
First estimate the answer!
Temperature hasn't changed much in absolute terms
volume has gone down by a factor of 4 - so we want a pressure of around 4 atm.

V1 = 1
V2 = 0.26
P1 = 1atm
T1 = 283K
P2 = ?
T2 = 305K

1/283 = 0.26 P /305
So P = (305 /283) / 0.26 = 4.1 atm or around 420KPa

ps. That's an impressive number of significant figures given the data!
 
  • #5
30
0
it asks for it in pa thats y
 

Related Threads for: But Pressure is Funner

Replies
4
Views
1K
Replies
3
Views
1K
Replies
3
Views
1K
Replies
1
Views
19K
  • Last Post
Replies
19
Views
2K
Replies
5
Views
13K
Replies
11
Views
2K
Replies
15
Views
1K
Top