Recent content by sci-phy

Pls find the attached solution. Couldn't type the entire thing.. :-p

For an ODE of order 2 like: X'' + λ*X = 0, how do I find the non-trivial solution in Mathematica 8? It's giving me only the trivial solution. In: ComplexExpand [DSolve[{u''[x] + \[Lambda]^2 u[x] == 0, u[0] == 0, u[a] == 0}, u[x], x]] and the out: u[x]--> 0 which is the trivial soln...

Hi, An electronics newbie here.. I'm trying to produce sound using a 555 timer. When I tried using the schematic(attached file), a definite sound came. But when I removed the capacitor C2 in the circuit, the sound (amplitude) actually increased! Why does this happen? Why then, do we use a...

Hey, I've just graduated with a degree in mechanical engineering and I'm planning to go for masters. But now, I've to choose between Applied mechanics, Machine design, Thermal sciences (Thermodyn and fluid mech) and Aerospace (Aerodyn in particular); all of which I like very much. I'm...

Hey , Earlier today, I discovered that on a metal frame in my house, rust was accumulating on the weld whereas other parts seemed ok. Some ppl told me that it was because the welded region was hotter and hence, it rusts faster. But I don't get it... The welded joint has been cool and at the...

Ah! Now I understand your question! :-p Finding h would be difficult indeed. But it can be done experimentally using heat exchangers. It's better to use Q= m^{.} c_{p} ΔT find heat transfer rate. Mind you, ΔT is the change in temperature over time of the cold water and NOT the difference in...

Hi risecolt, I don't think you need to go too deep into the physics of it. The power rating of the motor is enough. If the motor has rating P and the small gear is spinning with an angular velocity ω_{1}, the torque on the small gear is τ_{1} = P / ω_{1} . So, considering the gear ratio, the...

Sorry, but that's not true.. You always have to supply power (and hence torque) to overcome the friction.

For the question asked in the end... Yes it is possible. Again, it depends on whether the pipe is running full of water, or half or any other level.. The heat transfer rate is given by : Q = h.A.ΔT where h= heat transfer coefficient of water which depends on whether the water is still or...

I didn't understand your question properly. You are putting a heated cylinder inside a hollow one of the same internal diameter. How can the water pass through the hollow one? Isn't it sealed using the smaller solid cylinder??

Hey, Since the object is having sudden impact, the impact force will be more twice the load. The general equation of the impact load is : W+\sqrt{(W^{2} + 2AWhE/L)} where, W - weight of the object A - surface area of impact L- Length of the body perpendicular to surface of impact h-...

Hey, It depends on the surface you are talking about. If it is a sail, then it can deform so that the velocity of the wind is practically zero on the sail surface. So Bernoulli's principle would hold good. But if it is a rigid surface, the wind will get deflected and the force is based on...

Wow! Thanks! It was really helpful :smile: If it wouldn't be much trouble, can u also please suggest any good books/ref for the analytical design part? Like theoretical design of cams based on valve timing diagram, timing belts, crankshaft and it's balancing, design of rocker arms and it's...

Thanks for your advice! newbie here. Will keep that in mind :smile: I was just looking for a book or any other reference to understand design of Internal Combustion engines. Most books talk about air std cycles, radiators, carburetors and their thermodynamics etc.. I would like to know about...

Hey Everyone, I'm a mechanical engineering student and I was wondering if there was any good book regarding IC Engine design; which includes timing belt design, camshaft, crankshaft, rocker-arm, pump design etc.. a whole in one package that design engineers use for designing ic engines...