Recent content by machinarium

Hello everyone, please help me to answer this question. Is this true that any LTI system can be characterized by either its impulse response or engenvalue?

I forgot all about integral so I need some help from you. \int\stackrel{0}{-a}x(t)dt=\int\stackrel{0}{a}x(t)d(-t)=\int\stackrel{0}{a}x(t)(-dt) Please explain it to me. I want to transform \int\stackrel{0}{-a}x(t)d(t) to \int\stackrel{a}{0}x(-t)d(t) but don't know how.

Im sorry about the source. en.wikiversity.org/wiki/Passive_sign_convention Im confused of the arrows with V and its sign.

This is what I didn't understand about the picture. About the -VR and +VR, why do we have them, in both directions. I don't understand what they mean. Was A supposed to be more positive than B? I think I understand voltage and current but I haven't gained insight. That make me confused about...

Homework Statement The intensity of radiation reaching the Earth from the sun is 1350 W/m2. The Earth's radius is 6.4 × 106 m. How big a force does this radiation exert on the Earth (Assume it is all absorbed) The Attempt at a Solution F=AP=AI/c=2.3x109 N That's my answer. Is that...

I understand it. Thank you very much, gneill.

Homework Statement The Attempt at a Solution I don't understand why at the start, I20 was calculated like that, and why for a long time, IL=I20 Does that mean for the instant the switch was closed, the current just went through the resistors? And for a long time, the current...

Ah, I remembered it. Thank you for your commitment, ehild and gneill The potential through the inductor is 12 – (20 ohm X 0.5 A) = 2 V Then dI/dt=2V/10mH=200 A/s Is that correct?

Can you explain to me the whole problem? Please don't ask such a question, I was already very confused. Thank you.

Homework Statement For the circuit shown in Fig. 7, what is the rate of change of the current in the inductor when the current in the battery is 0.50 A? (1) 600 A/s (2) 400 A/s (3) 200 A/s (4) 800 A/s (5) 500 A/s Homework Equations i(t)=Imax(1-e-tR/L) induced emf = L (dI/dt)...

Thank you too much Oddbio. And I want too say more clearly about part c. That is the upper gate is placed accidentaly lower than before. So the problem ask us to calculate in that accident. (This is problem 113, chapter 2 - Motion in one dimension - Physics for Scientist and Engineers 6th edtion...

Please help me quick everyone, thank you in advance. Homework Statement http://imgkk.com/i/EasJ1d.jpg a/We have two photogates placed as in the figure. We drop a marble through these at a negligble distance above the upper gate. The upper starts a timer as the ball passes through its beam and...