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

AI Thread Summary
The discussion emphasizes the importance of showing an attempt at solving a problem before seeking help in the forum, as per the established rules. It highlights that asking if someone knows how to answer a question, especially multiple times, is considered disrespectful. A member pointed out that the lack of response from another user was due to not adhering to this rule, rather than a lack of knowledge. The conversation also acknowledges a positive attitude towards constructive criticism. Adhering to forum etiquette is crucial for productive discussions.
Rifat amin
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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
 
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Yikes, what happened to your equations?

Rifat amin said:
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... :smile:
 
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.
 
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mjc123 said:
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.
 
I appreciate you liking my post when it criticised you. That shows a good willingness to learn.
 
Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...

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