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Why do we ignore horizontal reactions at roller supports?

When talking about roller supports in a statics problem, we say that the roller prevents only the vertical translation of the beam, but not the rotation or the horizontal translation of it. So there is only one vertical reaction applied on the beam…
Eman.suradi
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Building RF power meter

I want to build power meter for wifi signals. One way to do it is to use a diode to rectify AC signal and amplify that before measuring. But are there diodes which work at such high frequency? Also, are there other methods?
wfn
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How to remove potting material from an electronic package?

I have an electronic device that uses black potting materiel similar the one below to I believe to protect the electronic components from elements. I would like to safely remove this material. This material might be some type of epoxy. There are…
DiaperHands
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Involute Gear Calculation

I've written a program to generate gears and write them to dxf files. I thought all was well until I looked at the mesh of two gears. From everything I've read there should be no backlash when the pitch circles touch. So I'm ether reading wrong,…
lakeweb
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How does a laser printer write with light on the photosensitive drum?

I want to understand how a laser printers laser writes on a photosensitive drum. I am trying to understand this process. the photosensitive cylinder is illuminated by a laser beam that projects above the negative of the image. After you…
user332153
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Sign convention in Mohr's circle

I don't really understand the explanation in the circled part of the image below (from here). From the diagram, we can see that the shear stress that cause the element to turn clockwise is positive, but in the text there, the author stated that the…
kitzlong
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Why do bluetooth headsets get interference (choppy sound quality) outdoors?

This is more of a general physics question to help me understand how to choose sports headsets in the future, however it is too specific to a certain use case (bluetooth headset) to belong in the Physics StackExchange. Problem: 3 of my 4 sports…
allanlaal
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Anomalous oxygen in aluminium sample SEM EDS

I have a sample of aluminium which I'm interested in finding the rough composition of. The sample is a part of a large number of samples which I sanded down and polished with a polishing table. I cleaned the samples with acetone, washed and rinsed…
Tapio
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How to simulate car acceleration

I am a high school physics student and I've been trying to simulate the acceleration of a car as it fully accelerates from rest, but I'm finding it's much harder than I thought. Here was my first attempt (without including air resistance): I used…
Ryan
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How to obtain sensor failure probabilities?

I'm a computer science student doing research in wireless sensor networks (WSN) optimization. Based on past research works, sensors are capable of failing due to a number of factors such as harsh environmental conditions, communication errors, and…
user8621
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What are the predominant types of concrete pumps and what are their working mechanisms?

I've looked around for different types of concrete pumps and simply don't know if there are many different types, what their mechanisms are and which ones are the most predominant ones. What I've found: This video explains how a pump with an…
JHK
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What is the correct pipe size for a 2inch pipe?

I'm was looking into the ASME B16.5Pipe flanges and pipe fittings and it has 2 dimension tables metric and inches. What I found was rather strange for me. I was looking at a 2 inch welding neck flange, and the hub diameter must match the pipe…
Mech_Engineer
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How to know which modes are excited by a given input in modal analysis?

Consider a simple structure such as a beam, plate, ... Assume that you know how to determine the different modes of vibration of the structure. You are given an external input, such as a force or moment at a certain location. How can you then…
Karlo
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How long can UK diesel be stored?

We have standby diesel generators that are only run a few times a year. How long can we reasonably keep the diesel stored on site before using or disposing of it? It is accepted that there is a finite shelf life particularly after the UK has started…
dhewett
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Contradictory units for moments of inertia

I'm looking at a motor datasheet where the moment of inertia is specified in units of "oz in sec^2". I would think that inertia should have dimensions of mass * length^2. I did some further Googling and found that some automatic unit conversion…
Max
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