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May
17
reviewed Approve suggested edit on Find the workdone to increase the temperature of an ideal gas by 300c if gas is expanding under
May
17
comment Find the workdone to increase the temperature of an ideal gas by 300c if gas is expanding under
Please see our homework policy. We expect homework and homework-like problems to have some effort put into them, and deal with conceptual issues. If you edit your question to explain (1) What you have tried, (2) the concept you have trouble with, and (3) your level of understanding, I'll be happy to reopen this. (Flag this message for ♦ attention with a custom message, or reply to me in the comments with @Manishearth to notify me)
May
17
comment If An Object Explodes With A Force, What Force Are Fragments Given?
@RBowen: It could be anything you want. Remember, the acceleration is only for a very small moment, so what is more important is the final velocities. Make sure you conserve momentum and energy when deciding the velocities.
May
17
answered Why doesn't light kill me?
May
17
comment If An Object Explodes With A Force, What Force Are Fragments Given?
@RBowen: highly dependent on the mechanics of the explosion. We usually assume that the acceleration is near-infinite and occurs only for a very short period of time. (See: en.wikipedia.org/wiki/Impulse_(physics) )
May
17
revised Is it possible to use quantum mechanics for an effective time based encryption?
edited title
May
17
answered If An Object Explodes With A Force, What Force Are Fragments Given?
May
17
answered Physics of a cold and hot top
May
17
comment Comparing Static Frictions
let us continue this discussion in chat
May
17
comment Comparing Static Frictions
@nonagon: In which case the system won't stay static.
May
17
comment Comparing Static Frictions
@nonagon: For the vertical cuboidal tunnel, it would depend on the shape. Torque comes into the picture here.
May
17
comment Comparing Static Frictions
@nonagon: The upper block isn't capable of providing an opposing force without moving itself. If the system is to stay static (if it can, it will), friction must come from the systems that have the capability to balance the friction. The ground can supply friction without moving. The upper block cannot. In case of three stacked blocks, the lower block can supply friction as it is capable of being balanced by ground friction.
May
16
comment Comparing Static Frictions
@nonagon: Depends if the force is enough to move part of the system. There are about four different cases here depending on the values of the friction coefficients and masses.
May
16
comment Comparing Static Frictions
@nonagon: Your comment makes no sense whatsoever :/ The system is static; to remain static the full frictional force must be on the bottom. If it comes from the top, the top block will move.
May
16
comment Question on the Hagedorn tower in Type I string theory
Please don't self-close, such posts may be useful to others. If you managed to answer it yourself I suggest you post your findings as an answer here.
May
16
revised Question on the Hagedorn tower in Type I string theory
edited title
May
16
comment Does quantum mechanics depend solely on electromagnetic waves?
Short answer: the uncertainty is always there. The EM thing is extended to all measurement methods due to wave particle duality.
May
16
revised Does quantum mechanics depend solely on electromagnetic waves?
edited title
May
16
reviewed Approve suggested edit on Finding current using EMF & internal resistance
May
16
reviewed Reject suggested edit on moment-of-inertia tag wiki