Recent content by Frangelo

Thanks! But still wondering then, if point S moves north, before the molecule immediately to the north of it has moved, that suggests either the two molecules are occupying the same space at the same time. Is that what is going on? Or maybe more like the molecules are forced closer to each...

Maybe a silly question, but I nevertheless interested in the answer. A steel rod oriented north south sits on a table. Consider two molecules, N and S, at the the north and sound end of rod respectively. A force in the northerly direction is applied on point S of the rod and the rod moves 1...

In this case that's not the issue. Note on the attached spec sheet they supply min and max displacement but they only supply a single value for torque at continuous pressure. If torque is the same with the smaller displacement has or the larger then something isn't adding up -- because torque...

Hello, I'm trying to compare efficiency of different hydraulic motors by looking at unit of output per unit of input, viz: \frac{rpm × torque}{pressure × flow} I'm a bit flummoxed by one set of motor specs, for Eaton Duraforce motors, which is attached below. these motors seem to...

Whoops, you're right. Read the table wrong. Also got the volume wrong. Also measuring weight in cm3 (!) (It was very late) Volume of water (7cm height, 3cm inside diam) = 49.48cm3 Weight of water: volume x .9998 = 49.47g Energy transfer out to reduce temp to 0°c: dQ = m ckJ dt | (49.47g x...

/Just to check that I've got a handle on the trivial -- Volume of water (7cm height, 3cm diam) = 115.45cm3 Weight of water: volume x .9998 = 115.43cm3 Energy transfer out to reduce temp to 0°c: dQ = m ckJ dt | (115.43g x 2.05 x 3c)/1000 = .71kj Heat of fusion (115.43 x...

Wow, more complicated than I thought. I would have thought that this type of problem would have been solved somehow or other to determine the time it takes for say, stationary water to freeze in a pipe, given a sudden drop in external temperature. Thanks for at identifying the various factors...

Still it is maybe easy to misinterpret for those not used to it. That fact that 10e-6 = 10-5 is well, confusing to the newbie. If the issue is its hard to type superscripts, I'd vote for how excel does it, 10^-6. Interestingly the Wikipedia article on the subject said " The use of this...

Suppose I have a closed end aluminum pipe of 3cm diameter with .5cm walls Cylinder is 10cm tall , 8mm of which is submerged in a cold bath of approximately constant temperature of -10°c I feel it with water at 3°c to 7cm height and stick a cork in it. How long till the water freezes...

Hi, If somebody could help me interpret the attached spec for this drive-shaft powered AC generator I'd be very grateful. The application is to power a 2500 square foot home in WA state in a remote location. This is a stand by system because the power is not reliable. The house has a...

May thanks. Got it!

cubic cm x cube with dimensions 100cm x 100cm x 100cm = 1,000,000. So cubic cm is 1/1,000,000 cubic m. 1x10e-6 = .00001. 1/1,000,000 is either 1 x 10e-7, or 1e-6, but not 10e-6, right?

Check it out: https://www.google.com/search?q=cubic+cm+to+cubic+m According to my math, 1 cubic centimeter equals 1x10-7 cubic meters not 1x10-6 cubic meters. Is is my calculator broken, or is this why Hubble telescope is near-sighted?

One other question -- I don't see a term reflecting viscosity of water in the bernoulli equation you mention. Is that because it has negligible impact on the result? If the flow consisted of more viscous hydraulic fluid would the same equations apply, just changing density value for the proper...

That's great Voko, thanks. I'm not sure exactly what the exact pressure and flow requirements will end up being (the 500PSI/200PSI 10 gal/min were just placeholder). In practice the pressure inside the tank will be measured constantly as will the flow rate and pressure to the motor. The valve...