The absolute-units tag has no wiki summary.
4
votes
7answers
358 views
What exactly are we doing when we set $c=1$?
I understand the idea of swapping from unit systems, say from ms$^{-1}$ to kms$^{-1}$, but why can we just delete the units altogether?
My question is: what exactly are we doing when we say that ...
3
votes
2answers
429 views
Can entropy be equal to zero?
I've searched for it but I only found contradicting answers from "scientists":
Mr. David Balson, Ph.D. states: "entropy in a system can never be equal to zero".
Mr. Sam Bowen does not refutes the ...
2
votes
3answers
274 views
Planck time, distance, mass? Why do we take those values?
Say we want to make an educated guess for critical values of time, distance and mass, where quantum gravity effects are supposed to be non-negligible. These values are given the prefix "Planck-". Now, ...
9
votes
5answers
959 views
How to get Planck length
I know that what Planck length equals to.
The first question is, how do you get the formula
$$\ell_P~=~\sqrt\frac{\hbar G}{c^3}$$ that describes the Planck length?
The second question is, will any ...
3
votes
1answer
192 views
How is the apparent significance of (length) scales in physics explained?
From what I understand, especially from reading arguments on Physics.SE, different (length) scales of a system are extremely important. It's clear that if there are two scales $\delta,d,D,\Delta$ with ...
1
vote
3answers
199 views
Quantum of Time
I am not a String Theorist, but I just want to ask if there is anything which specifies a quantum of time, as per M-theory?
Can a quantity such as $$ t_p = \left(\frac{\ell_p}{c}\right),$$
where ...
0
votes
4answers
12k views
Heat transfer calculated from the specific heat formula
Say I have 10g of silver, whose specific heat is known to be 0.235. I've heated it up from 50.0C to 60.0C. How much heat has been transferred?
The equation is:
$$ Q = C_pm\Delta t $$
where Cp is ...
