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HNQ
3:43 AM
1
Q: Why is the centre of mass of a semicircular wire outside the body?

Angeline vargheseWhy it makes no sense is because centre of mass (COM) is a place where the mass of the whole body is present. Why can't we think like this: "When the semicircular wire is stretched and made to a straight wire the COM will be at the centre, right?". But COM of semicircular wire is $2R/\pi$ from th...

 
 
2 hours later…
HNQ
5:50 AM
2
Q: How can the heat capacity of diamond be so low?

arandhawI'm taking an introductory thermodynamics course, and according to my professor, the heat capacity of an ideal gas is $\frac{3}{2}R \approx$ 12.5. Since ideal gases don't have any attraction between molecules, every bit of energy put into the system goes towards increasing the Kinetic energy of m...

 
 
11 hours later…
HNQ
5:14 PM
3
Q: If we repeatedly divide a solid in half, at what point does it stop being a solid?

Young KindaichiSuppose I have some material in solid-state (say), I cut it into two parts. Take the first cut it into two parts, take the first cut it into two parts, and then repeat this again and again. There will be a point when the substance loses its solid property. I'm interested in this point. I realize ...

 
 
1 hour later…
HNQ
6:30 PM
3
Q: What is the analogue for symplectic structure in case of spin variables?

WouterAccording to some (e.g. Haroche and Raimond in Exploring the quantum: atoms, cavities and photons), the quantum world consists (mainly) of spins and harmonic oscillators. For harmonic oscillators (i.e. bosons), it is well known that they can be appropriately described in $(x,p)$ phase space, whic...

 
 
3 hours later…
HNQ
9:54 PM
2
Q: How to calculate the potential energy of coupled oscillators?

Nice1m80 The equations of motion that describe the above situation is given by: $$ m \ddot{x_1} = -2kx_1 + kx_2 $$ $$ m \ddot{x_2} = -2kx_2 + kx_1 $$ Now I want to work out the potential energy of this system. How would I use the equation: $$ V(x) = - \int F(x) \hspace{.1cm} dx$$ to calculate the potenti...

 

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