Backup Room – The h Bar

« first day (3061 days earlier) ← previous day next day → last day (636 days later) »

2:49 AM

Q: Does isothermal expansion not beat the efficiency of Carnot Heat Engine?

Ques: If I just take the 1st step of a Carnot Heat Engine (CHE) than it turns out to be more efficient than the CHE itself. Explanation: The 1st step of a CHE is the pure isothermal expansion of (ideal) gas where all the heat($Q$) taken from the source reservoir is converted into work($W$). That ...

5 hours later…

HNQ

7:22 AM

Q: How can I know who is accelerating? – Inertial reference frames and relative motion

Suppose I (observer $I$) am standing somewhere in space. I see a region in which my friend ($F$) is accelerating in some direction $\mathrm{\mathbf{\hat{u}}}$. Suppose I see everything in $F$ accelerating in the same direction. My question is: how can I know if I am an inertial frame of reference...

newtonian-mechanics reference-frames acceleration inertial-frames machs-principle

6 hours later…

HNQ

1:48 PM

Q: Confusion About Energy Bands

I read about energy bands in a physics textbook, and I couldn’t understand one thing about them. The book defines an energy band as continuous energy levels of electrons that are so plentiful that they are like a continuous band. But, isn’t it impossible for energy levels of electrons to be conti...