Compressed gases aren't ideal. let's consider a gas that's non-ideal only because the volume available to each of the n molecules is reduced because each other molecule occupies volume v. instead of pv=nkt, we get: p(v-nb)=nkt. let b=7 × 10^-29 m3. let's look at 3 moles of this gas at t=300k starting in 0.001 m3 volume.

1) what's the initial value of the pressure? p_initial = ?

2) the gas expands isothermally to 0.002 m3. what's the final pressure? p_final = ?

3) how much work did the gas do in this isothermal expansion? w = ?

8563732.58906 Pa

3992793.23326 Pa

5708.00923 J

Explanation:

V = Volume

N = Number of molecules =

T = Temperature = 300 K

b =

= Boltzmann constant =

P = Pressure

We have the equation

The pressure is 8563732.58906 Pa

For isothermal expansion

The pressure is 3992793.23326 Pa

Work done is given by

The work done is 5708.00923 J

photocells convert light energy to electricity

energy stored in the capacitor= 9.72 x 10⁻⁴ j

explanation:

the energy stored in the capacitor is given by

e= 1/2 c v²

e= energy stored

c= capacitance= 1.5 µc= 1.5 x 10⁻⁶f

v= potential difference=36 v

so energy stored= e= 1/2 (1.5 x 10⁻⁶) (36)²

energy stored= 9.72 x 10⁻⁴j