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We started this section by popular requests. Most visitors of our site are technical people highly skilled in their professional areas. This is the place to ask technical questions, and very likely to hear the answers from an expert. 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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