Recent content by CWatters

I don't think Cos(psi) is necessarily a real angle you can point to on the drawing. I might be wrong but I think he introduced Cos(psi) just to simplify the equation for h. He defined Cos(psi) right below so you could substitute and eliminate Cos(psi) from the equation for h to produce a new...

Does anyone know how this motor from Quantum Energy (aka Inductance Energy) works? They have a series of videos on their channel, this being is just the latest. I think their facory in Byron, Wyoming was part funded by a government loan.. Factory and training/recruitment center..

Thanks for the replies. Yes I said bolt but the actual situation was a threaded stud. I hadn't thought the difference mattered but can see it could.

Not homework and I'm not a Mech Eng. I was trying to follow a discussion elsewhere about a building foundation that involved 2.75" diameter steel bolts. Two nuts are locked together on the bolt and embedded in concrete. Threads of the bolt itself are sleeved so only the nuts are anchored into...

a = (6t^2)/5 Mass is 2.7kg not 5kg? Or is your problem slightly different?

Do we really want to collect more energy from the sun and inject it under the blanket of our atmosphere? Should we be trying to do the reverse? Set up transmitters to beam energy into space to get rid of it and cool the planet? I'm only half serious.

Not sure what's behind the original question but some people think that reducing or eliminating back emf is the key to making a motor more efficient (possibly more than 100% efficient but obviously that's not possible). This is wrong. Some modern DC Brushless motors are incredibly efficient, as...

When you remove the battery does the +ve battery terminal short the power supply by contacting the -ve terminal on the pcb? Especially if you have it the other way up to press the buttons. Try replacing the battery with cardboard when on the power supply.

Bit of a long shot but can anyone remember a TV program where the presenter measured the weight of something at ground level and compared it to the weight at the top of a tall building, possibly the Empire State building? Sorry I can't recall more details. Think it was at least 10 years ago...

Imagine what happens if the small block is constrained to move vertically downwards. The wedge would be squeezed and pushed to the left. Similar to squeezing a slippery melon seed between fingers.

+1 I would treat the diode as a switch. Forward Bias = Switch is conducting => the output is connected to 0V Reverse Bias = Switch is open => the output is just connected to the input via the resistor.

Here in the UK we have an Open University which mostly runs courses for people in employment by post/internet. Some years ago my wife did a management course while she was in full time employment. It was quite a lot of work but not impossible. If your employer is offering to pay you to do a...

Thanks Chester! That was the problem. Looking back at his notes confirms you need to integrate over the length of the gate to get the net force and moment. He's written it up in the attached MSword doc.

My son and I are having a problem with part c that suggests our answer for part a and b are wrong.. Part a). If we've understood the teaching notes correctly the force on the gate acting through its centroid perpendicular to the gate and is given by F = ρgAd where ρ is the density of water...

It's possible to use Comsol to model a simple truss and the resulting frequency response looks like a single degree of freedom system. Using that data you can calculate a value for the spring constant, damping, and equivalent mass of the system etc and plot the frequency response of an ideal...