Warning: Illegal string offset 'html' in /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php on line 909

Warning: Cannot modify header information - headers already sent by (output started at /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php:909) in /home/hsn/public_html/forum/admin/sources/classes/output/formats/html/htmlOutput.php on line 114

Warning: Cannot modify header information - headers already sent by (output started at /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php:909) in /home/hsn/public_html/forum/admin/sources/classes/output/formats/html/htmlOutput.php on line 127

Warning: Cannot modify header information - headers already sent by (output started at /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php:909) in /home/hsn/public_html/forum/admin/sources/classes/output/formats/html/htmlOutput.php on line 136

Warning: Cannot modify header information - headers already sent by (output started at /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php:909) in /home/hsn/public_html/forum/admin/sources/classes/output/formats/html/htmlOutput.php on line 137

Warning: Cannot modify header information - headers already sent by (output started at /home/hsn/public_html/forum/cache/skin_cache/cacheid_1/skin_topic.php:909) in /home/hsn/public_html/forum/admin/sources/classes/output/formats/html/htmlOutput.php on line 141
2002 Past Paper Q22ci - HSN forum

Jump to content


2002 Past Paper Q22ci


1 reply to this topic

#1 jambo david

    Showing Improvement

  • Members
  • PipPip
  • 42 posts
  • Gender:Male

Posted 16 January 2006 - 04:52 PM

Calculate the force exerted by the nitrogen on the piston when the reading on the pressure gauge is 1.75*10^5Pa.

I tried using p=f/a but there is no area given that i can see.

#2 Nathan

    Fully Fledged Genius

  • Members
  • PipPipPipPipPipPipPip
  • 1,736 posts
  • Location:Aberdeen, Scotland
  • Gender:Male

Posted 16 January 2006 - 05:52 PM

22.a. P1 = 109kPa
T1 = (15+273)K = 288K

  P2 = ?
T2 = (45+273)K = 318K

P1/T1 = P2/T2
P2 = P1T2/T1
P2 = 109x318/288
P2 = 120.35kPa


   b.   As the temperature increases the nitrogen gas molecules gain
kinetic energy. With increased kinetic energy the atoms are moving
faster and collide with the container walls more frequently
and forcefully. The pressure(force/area) therefore increases.

  c.i. P = 1.75x105Pa
A = 4.0x10-6m2

F = PA
F = 1.75x105x4.0x10-6
F = 0.7N

  c.ii. Read from the graph the length of the spring when the force
is 0.7N.

Length = 35mm

  d. The assumption in the original set up is that the temperature
of the water is the same as the temperature of the gas inside
the flask. Placing the thermometer inside the flask will give
a more direct and accurate reading of the gas temperature.


Area of piston is given in Q as 4.0 x 10-6m2

Edited by nathanm, 16 January 2006 - 06:06 PM.






1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users