Posted by Sammy on Saturday, July 13, 2013 at 2:18pm.
7 Moles of a gas initially at temperature 300 K is compressed adiabatically from a volume of 1000 cm3 to a volume of 316 cm3. To the nearest tenth of a kJ what is the work done by the piston? (It is a monatomic ideal gas.)
I have W = (3/2)nRT1(V1^(gamma1) V2^(1gamma) times 1)
I tried to set it up and I got 56.4 but the answer was 30.3. Can someone tell me what I did wrong and tell me how to properly calculate it? Thanks!

College Physics  Elena, Saturday, July 13, 2013 at 5:21pm
v= 7 moles,
T₁=300 K
V₁=1000cm³= 10⁻³ m³
V₂=0.316•10⁻³ m³
W= {(vRT₁)/(γ1)} •[1(V₁/V₂)^(γ1)]=
γ=(i+2)/I =(3+2)/3 = 5/3
γ1=5/3 1 =2/3= 0.667
W= {(vRT₁)/(γ1)} •[1(V₁/V₂)^(γ1)]=
=  { 7•8.31•300/0.667}•[1 (10⁻³/0.316•10⁻³)^0.667] =
= 30252 J =30.252 kJ ≈ 30.3 kJ

College Physics  Josh, Thursday, July 25, 2013 at 9:50am
An ice skater spinning with outstretched arms has an angular speed of 5.0\({\rm rad/s}\) . She tucks in her arms, decreasing her moment of inertia by 19\({\rm \%}\) .
By what factor does the skater's kinetic energy change? (Neglect any frictional effects.)
Answer This Question
Related Questions
 physics  10 moles of a gas initially at temperature 300 K is compressed ...
 ALGEBRA  The temperature, T, of a given mass of gas varies inversely with its ...
 Physics  The internal energy of a gas is 900 J. The gas is compressed ...
 Chemistry help??!  A student reduces the temperature from a 300 cm3 balloon ...
 physics vry urgent  An ideal monatomic gas initially has a temperature of 333 ...
 physics  An ideal monatomic gas initially has a temperature of 338 K and a ...
 physics  An ideal monatomic gas initially has a temperature of 338 K and a ...
 physics  An ideal monatomic gas initially has a temperature of 338 K and a ...
 Intro to Physics  (a) An ideal gas occupies a volume of 3.0 cm3 at 20°C and ...
 physics  Oxygen gas having a volume of 784 cm3 at 23.3°C and 1.03 x 105 Pa ...
More Related Questions