Below 20K, The specific heat capacity c of silver varies with temperature

[Rifat amin]

Homework Statement

Below 20K, The specific heat capacity c of silver varies with temperature according to the equation
c
/
J /kg /K
=
1.5
x
10
−
4
(
T
/
K
)
3
+
6.0
x
10
−
3
T
/
K
. If a small silver sphere of diameter 4am and at 20K is placed in 25g of liquid helium at 4K, what fraction of the liquid will evaporate?
[Density of silver = 1.05E4 kg/m^3, specific latent heat of vaporisation of helium = 2.1E4 J/kg; boiling point of helium = 4K]

Relevant Equations

c
/
J /kg /K
=
1.5
x
10
−
4
(
T
/
K
)
3
+
6.0
x
10
−
3
T
/
K

Not attempt

 

[berkeman]

Yikes, what happened to your equations?

Not attempt

And keep in mind you *always* have to show your attempt at the solution before we can provide tutorial help. That's in the PF rules...

 

[mjc123]

Don't ask "Do you know how to answer it?" (especially twice). That is disrespectful. @berkeman didn't answer your question, not because he doesn't know how, but because, as he clearly said, it is a forum rule that YOU must show some attempt at a solution before receiving help.

 

[Rifat amin]

Solved

 

[Rifat amin]

Don't ask "Do you know how to answer it?" (especially twice). That is disrespectful. @berkeman didn't answer your question, not because he doesn't know how, but because, as he clearly said, it is a forum rule that YOU must show some attempt at a solution before receiving help.

Thanks.

 

[mjc123]

I appreciate you liking my post when it criticised you. That shows a good willingness to learn.