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visits member for 2 years, 5 months
seen Mar 23 at 14:04

Feb
27
asked Regelation, ice cutting, and snowballs
Jan
19
comment Can work hardening of a metal be avoided?
Annealing maybe?
Jan
17
answered How does the net torque have to be 0 at all points for static equilibrium?
Jan
15
revised transfer of heat from lower to higher temperature
added 612 characters in body
Jan
15
answered transfer of heat from lower to higher temperature
Jan
15
comment Why do I hear a deep rumble when I cover my ears?
No it's a barrier and it's density is mass per unit area, or kg/m^2.
Jan
15
answered Why do I hear a deep rumble when I cover my ears?
Jan
13
awarded  Nice Answer
Jan
13
revised Why is the harmonic oscillator so important?
added 9 characters in body
Jan
13
revised Why is the harmonic oscillator so important?
deleted 1 character in body
Jan
13
answered Why is the harmonic oscillator so important?
Jan
13
answered Why is wax brighter?
Jan
13
reviewed Approve would a supermassive black hole accretion disk really vaporize solid objects?
Jan
12
asked would a supermassive black hole accretion disk really vaporize solid objects?
Jan
12
comment Show bigger amplitude of physical pendulum means bigger period
The "hot water freezes faster" can't happen IF the entire system is described by one degree of freedom: the temperature. Real life hot water can freeze faster (cdn.phys.org/newman/gfx/news/hires/…) when the actual system is more complex. A pendulum bob has 2 degrees of freedom: force and velocity. A faster bob can surpass a slower one because velocities are different. Temperature does not have a "velocity term" appearing in the differential equation that governs it's change. Position does.
Jan
12
comment Why is it so hard to find out the sign of the cosmological constant?
Don't we know that the expansion is accelerating en.wikipedia.org/wiki/Accelerating_universe (only possible with a positive constant).
Jan
9
comment Some applications of the Einstein-Podolsky-Rosen (EPR) paradox?
The Mermin-Peres magic square game?
Jan
9
comment Why are gasses difficult to see?
Yes, but: there isn't that wide a range for which photochemical sensors can work, and the atmosphere is transparent enough over most of this range. Vision at other wavelengths, like snake pits, has very low resolution.
Jan
9
revised Why are gasses difficult to see?
added 4 characters in body
Jan
8
comment what is the electric field intensity inside a charged metallic shell if there is a point charge inside the shell?
You are right but it's the charges that appear at the surface are not the same charges you put in. If you put in a bunch of a + charge calcium ions, electrons will leave the surface to give it a positive charge. No calcium ions need to make it to the surface.