Recent content by lonelypancreas

Homework Statement Two 3-phase 60-hertz 35-kilovolt synchronous generators (G1 and G2) each have synchronous reactances of j9 ohms per phase with negligible armature resistance. They are connected in parallel to supply a 36-megawatt load at rated voltage and power factor of 0.90 lagging...

Homework Statement Are ALL parallel plate capacitors linear? Homework Equations D = permittivity * E The Attempt at a Solution Capacitance is linear if permittivity is constant. Is there a case where a parallel plate capacitor is not linear?

Homework Statement What is the net heat flow of an aluminum disk (emissivity = 0.05) with radius 10 cm and temperature 293K placed inside a room where the temperature is 300K? Asurface = π*r2 = 0.01π m2 Homework Equations Hnet = A*e*σ(Tradiate4-Tabsorb4) The Attempt at a Solution By simply...

I think I'm kinda lost. So do I have to include the potentials from point A with respect to ALL equipotential surfaces? (i.e. 106-104 V, 108-104 V, etc.)? And with respect to the 102-V surface, is the coordinate of the point below point A relevant? If so, how do I get its coordinate?

Homework Statement This is from the book Engineering Electromagnetics by Hayt & Buck.[/B] Homework Equations E = - (ΔV/ΔL)[/B]The Attempt at a Solution At part (a), I took the potential difference between point A and the point directly above at the higher surface (106 V) and plugged in the...

E = pc is the same as E = (mc)c --> E = mc^2 right? I still haven't encountered relativity so I'm not quite familiar with that famous equation but I think through your answer, it made sense. Thanks.

Since Work = F*delta(d) and Impulse = F*delta(t) then dividing work over impulse, through simple cancellation of F we can say that it is now equal to delta d / delta t which is equal to velocity right? My question is, does this make sense "physics-wise" since I onlu arrived at my answer through...

Yes. To share something told by my physics teacher, scientists can determine the speed of light relatively "easier" when it moves through a liquid medium like water compared to when it moves through air. (I think its refractive index is close to vacuum? Correct me if I'm wrong)

No, it is not possible. During an elastic collision, linear momentum is conserved as well as the total kinetic energy of the system before and after the collision so after an elastic collision, the kinetic energy will also be conserved. Upon contact, energy will be transferred. Therefore, the...

It's really helpful if you take into account the free-body diagrams of the objects in the system. Just like how others responded by "guessing" the direction, if your guessed direction is negative then that just means that your direction is towards the opposite true direction of the acceleration.

Hi, I'm currently a freshman electrical engineering student in a university and I'm having a dilemma if I am to transfer to physics or no. First of all, I chose my current program because of our electronics elective class in high school. I enjoyed the experiments back then and the projects as...

Hi! It's my first time to register in this site but I've been reading threads here since a long time now. I'm a freshman engineering undergraduate student whose enthusiasm for this field of science is high, especially for optics. I really enjoyed our light box activity in my high school days...