My CO2 extinguisher has a restriction placed at the point in the gas horn where the CO2 enters it. Why would anyone want to reduce the gas pressure here and speed the gas up when the pressure in the CO2 reservoir is pretty high to begin with and could generate a stream that moves fast enough...
I see. Thanks. Just one more question if I may. If the universe is 98 BLY across, where are we in relation to the edges? And if we take the ratio distance/time we should get speed. But the ratio is 98/13.7 = 7.15 with no units. Why don't we get units?
If the visible universe began as a single dot and inflated in a very short time then its size as measured from standard candles and red shifts would presumably give us its present size and speed of regression. But its age wouldn't be the same number of years as the number of light years of its...
mfb said "No. Why should it make the universe older if things move away from us?" Well it seems to me that when things move away it will take time to do so. This makes the things older. In order to travel from a more distant point to us it takes longer for light to travel. This also makes the...
I read in Professor Roger Penrose's book "The Road To Reality" in section 20 dealing with gravity's role in quantum state reduction that the total gravitational energy of two masses is different when they are separated than when closer together. So would this mean that in this case greater...
Hi guys. I don't profess to know much about suppressing the sort of stuff you are discussing but it seems to me that if you were to hire a digital recording 'scope with memory and connect one channel to one side of the relevant relay contact and the second channel to the other and make sure the...
Hi anorlunda and berkeman. I agree that I must be over thinking this. I understand what both of you say and I was wrong to say otherwise. Thank you for your advice.
OK, well perhaps the answer to my question is this and hopefully it will explain my problem better. If the resistor is R and its image at the collector is only a virtual resistor, we say it's real because algebraically it is but it's only virtually real. With the distance separating R and the...
hi berkeman. I agree that feedback would alter it but let's suppose no feedback, for now. Yes I agree the load resistor connected to the transistor is the one reflected back through the matching transformer but this reflected one doesn't dissipate any power (forgetting small losses). And I agree...
Bernoulli's theorem says that there will in fact be pressure on the bottom of the rocket case but because the speed of the exhaust is greater there than it is elsewhere, the gas pressure will be lowered compared to elsewhere. Therefore there will be a net force acting along the axis of the rocket.
If an amplifier (audio or RF) has the collector of a transistor for its output electrode and assuming the transistor operates in its active region (not saturated or cut off) the output impedance of the amplifier will be high (several 10s of kilohms). If now a tuned circuit is connected as a load...
Why is space intrinsically curved?
Matterwave, thanks for your reply. I'm reading those references now and finding it a most interesting subject. Thanks again.
space curvature
Could someone please explain the reason why we asume that space which has no massive objects nearby is regarded as not being curved, or at least only very slightly curved in that location? What does "curved" mean and where does the non curvature of empty space originate, ie what...