# udiboy

less info
reputation
524
bio website none location Mumbai, India age 17 member for 1 year, 8 months seen Apr 7 at 5:28 profile views 261

A student and enthusiastic programmer. Love learning Physics! And I make android apps as a hobby.

This will make a great and interesting site : Puzzling. Please follow it

Please support Mechanical Engineering. There are many questions on PhysicsSE site related to engineering, which do not get answered because they are off-topic.

# 621 Actions

 Jul9 suggested suggested edit on Reconciliation of a particle's rest frame and the uncertainty principle Jul9 asked How can we consider charge to be continuous? Jul9 comment Extreme heating by Sun on Earth- Can eggs be fried? So keeping the egg in an evacuated chamber with a thermally insulated base would cook the egg? How much time would it take? Jul9 reviewed No Action Needed How early might a moon-sized asteroid be detected? Jul9 comment Beads in 'perpetual motion'? Hey, I added the answer in the edit. Jul9 revised Beads in 'perpetual motion'? Added to answer for question asked by OP in comments Jul9 revised Perfect pinhole diffraction pattern with sharp fringes using a 632nm laser Changed a few words regarding question Jul8 comment Center of a mass of a hemisphere You must have calculated inertia using $\int dm r^2$, where $r$ is the perpendicular dist. from an axis. Well, the position of center of mass is given by $\int dm \vec r$, where $\vec r$ is the position vector of an elementary mass $dm$. Maybe that helps! Jul8 answered Beads in 'perpetual motion'? Jul8 revised How does sun light after it has passed window's pane still heat me up? Grammar corrections. Jul8 comment Why is the angle of impact complementary to the angle of launch in the simple equations for the range of a projectile? Is $\theta=\frac \pi 4$ when range is maximum even for uneven ground? This seems a little strange to me. Jul8 reviewed Reviewed Perfect pinhole diffraction pattern with sharp fringes using a 632nm laser Jul8 suggested suggested edit on Perfect pinhole diffraction pattern with sharp fringes using a 632nm laser Jul8 comment Taking length/area element when trying to find E.resistance In the second case, you cannot say $dA=2\pi(b-a)dz$, because even if the resistivity is constant radially, the resistance changes because the area through which the current is passing increases with every increment of $dr$. The equation @Ali suggests for $dA$ is correct and it will give you a dual integral, first through $r$ fro every $dz$ and then through $z$ Jul8 answered Costant volume gas thermometer Jul8 comment Explaining lightyear to non technical people Just like @annav describes, we usually approximate walking distances to "5 minutes away" or "10 minutes away". It's extremely similar to using light year as a measure of distance. If they are teenagers, you could joke about describing distances as "2 or 3 songs away" where 1 "song" is approximately 3 minutes! Jul8 awarded Custodian Jul8 reviewed Reviewed How does sun light after it has passed window's pane still heat me up? Jul8 suggested suggested edit on How does sun light after it has passed window's pane still heat me up? Jul7 comment Friction acting on a particle on a rough place @Jonathan. ,if the spring is stretched to a point where the spring force exceeds the gravitational pull, the friction will act down the plane. Remember that friction always tries to oppose relative motion or the tendency of relative motion. Usually, we can calculate the net force due to all other forces except, and say that friction will act opposite to the net force vector. But beware, this only works if all the other forces are independent of the friction force.