Recent content by poont2

Correct me if I am wrong, the answer of this question is that when we restrict more flow, we create more pressure, and this pressure will slow down the pump, and therefore less flow. So there its no way to increase the MASS flow rate of this system, we can only decrease it using damper or any...

interesting answer here =) http://www.thenakedscientists.com/forum/index.php?topic=28662.0;prev_next=prev" http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.html"

my mistake, so even if i use the surface area of the emitting body. And only a very small percentage of heat from the sun get to the human body because sphere radiate in every direction. Can human body radiate into empty space, or one can only radiate into another matter? if so So how could one...

So what about the heat transfer side of the question? ignore all other effect,assuming that the main souce of heat transfer are radiation from sun to body and radiation from body to surround, using the equation of radiation. using this equation , from sun to body A, Area is limited to...

OMG this diagram just blew up my brain, lol. what is that gear and what is that grey vertical teeth? Let me spend some time to understand it, I guess I have less than half of a brain of normal human... But one thing I am wondering, when the car with propeller is stationary with no wind, and...

thx for the reply , Twice in size, that's very interesting. I thought we would die really quickly if we expand twice in size in such quick time. For the SpaceSuit, does it mean that the suit has to be very strong to keep the original shape in close to vacuum space ? And since the suit is...

Hello PF, I was wondering how cold would it be for a human to be in space without any suit or insultation. Assume that human have a oxygen tank, so don't worry about suffocation. What are the main factor? Since there are close to no matter in space, we can ignore convection and conduction...

Hello guys, I recently got an internship at a engineering consultant firm doing HVAC work. I am kinda confuse on one thing. How does HVAC dampers work? I have always learned in school the continuity equation Q=AV=AV , Q = the volumetric flow rate A = the cross sectional area of flow V...

sorry i forgot to post the question, it is What is the temperature at the midpoint where the rods are joined together?

Homework Statement A cylindrical copper rod and an iron rod with exactly the same dimensions are welded together end to end. The outside end of the copper rod is held at 130 C, and the outside end of the iron rod is held at 0 C What is the temperature at the midpoint where the rods are joined...