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We started this section by popular demand. Many visitors of our site are professionals that are highly skilled in a variety of technical areas. Thus, this is a great place to ask technical questions and hear what others have to say or contribute your expert opinion and help others! Your opinion counts! |
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How to measure speed of a tennis ball...
by Merc_1976.
During big tennis tournament there is a large score table reporting speed of a tennis ball after every serve. What type of sensors or radars do they use?
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Automatic control of a stage projector ... by Merc_1976.
My neighbor plays bass guitar in a band. He told me that they had a light effects system that included a joystick to manually control projectors. There is an operator who's job is to focus the light spot on a singer while she moves around the stage. I have been thinking lately what would be the best way to automate that process. Any ideas?
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Applying black paint to a heat sink: better or worse?.. by Johan_son.
Had an argument recently with a coworker from manufacturing dpt: they apply black paint to increase performance of a heat sink. I don't think it's a good idea, because paint provides thermo insulation. Am I right ?
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Phone for mute pepople?.. by Anonimous1.
Is there a way to design a phone for mute people ?
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Better road grip with wider tires?.. by Victor.
Most people agree that a car with wider tires has better road grip, but the theory doesn't seem to explain this? I remember from school that a force of friction depends on surface and weight and has no relation to the area:
F = kN,
where k - friction coefficient depending on material, N - is a normal fource proportional to the weight of a car.
What am I missing?
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Measure multiple points... by Seviri.
I Would like to get experts opinion on the following problem. I am taking voltage measurements at multiple points. The data is within 1v...2v range. Will I get better accuracy if I use the same instrument for all measurements rather than taking parallel measurements ?
thanks.
Seviri P.
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Question to power supply experts... by vball13.
I need to build a test bench for a chip. The chip has a block that when enabled draws 1.6A from a supply during 5nS. The problem is I need to put 20 chips on the test board. Any suggestions?
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Granite ball in San Diego... by alex.
Here is another pickle for you dear experts!
Last month I took a trip to San Diego, CA. I waited for someone in the coffee shop downtown La Jolla.
They have a small fountain right in front of that shop. Nothing unusual on the first sight. The fountain is in the form of a plate. There is a ball on that plate, and water comes from underneath the ball. When I came closer I noticed that the ball seem to be floating on that plate. It must have made from rubber...
I touched it: no, the ball as well as the plate were made from granite. And again the ball was floating... I am an engineer myself. My best guess would be that the water pressure keeps that granite ball floating. Is it so, or is there another trick?
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2 outlets in series? by A3.
Hi, can I connect two ~110v outlets in series to double the voltage?
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