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Oct
28
comment How is one process reversible and its reverse non-reversible?
Yes. That's right.
Oct
28
answered How is one process reversible and its reverse non-reversible?
Oct
27
revised Why are basic physics problems neglecting to include atmospheric pressure?
added 2 characters in body
Oct
26
awarded  Nice Answer
Oct
26
comment Why are basic physics problems neglecting to include atmospheric pressure?
Because the air underneath the block is exerting approximately equal pressure upwards. If you truly made a seal with the table so that no air could get it, it would be extremely difficult to lift the block. This is how a suction cup works.
Oct
26
answered Why are basic physics problems neglecting to include atmospheric pressure?
Oct
26
revised Why are basic physics problems neglecting to include atmospheric pressure?
added 34 characters in body; edited title
Oct
26
answered Trajectory of a projectile in a three dimensional space
Oct
24
awarded  kinematics
Oct
23
comment How do I use the kinetic energy formula using mass as lbs and velocity as mph?
that's the idea, but I don't think you converted to kg correctly
Oct
23
revised How do I use the kinetic energy formula using mass as lbs and velocity as mph?
edited body
Oct
23
comment How do I use the kinetic energy formula using mass as lbs and velocity as mph?
en.wikipedia.org/wiki/Pound_(mass)
Oct
23
answered How do I use the kinetic energy formula using mass as lbs and velocity as mph?
Oct
23
comment Why don't we include the adhesive and cohesive force while calculating rise in a capillary tube?
The derivation I gave used $\gamma$ for the energy per unit area of the water-tube interface. You can put whatever name on that you want. I did not reference the water-air interface.
Oct
23
comment Why don't we include the adhesive and cohesive force while calculating rise in a capillary tube?
I can't fathom why you think they're being omitted; I explicitly included them as $\gamma$.
Oct
22
answered Why don't we include the adhesive and cohesive force while calculating rise in a capillary tube?
Oct
22
comment Why don't we include the adhesive and cohesive force while calculating rise in a capillary tube?
Your second equation does not follow from the first equation.
Oct
16
comment Why can we find forces like this using energy methods?
Gerard, I am describing the asymptotic behavior of the integral to first order in $\mathrm{d} \theta \equiv \theta_1 - \theta_0$
Oct
16
answered Why can we find forces like this using energy methods?
Oct
9
awarded  Nice Answer