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Multiple power supplies
Asked by colbtech, Nov 15, 2018 01:25 AM in Electrical Engineering
Morning all, Been a while. I have a greenhouse project in the near future that requires a weatherstation in the packing shed controlling several...
Building a circuit
Asked by RickSmitChina, Nov 14, 2018 12:25 AM in Electrical Engineering
Why does it every diagram of a circuit choose that the current comes from the POSITIVE side? I understand that they choose to believe that the...
Transistor secrets
Asked by RickSmitChina, Nov 14, 2018 12:18 AM in Electrical Engineering
Is there a reason why there is a need to connect a powerful resistor to the base pin of a transistor, other than the base has a lower maximum current...
How do complex waves and harmonics work?
Asked by Allen Farber, Nov 11, 2018 12:25 PM in Physics
So from what I understand, a sine wave is a sound wave that vibrates at only one frequency. So a sine wave of 220hz vibrates at just 220 cycles per...
Asked by trauden, Nov 8, 2018 04:05 AM in Mathematics
Dear all members, Anyone knows this non-linear differential equation related to what mechanic system. x ̈+x ̇^3+x=0 (or dx/dt=z, dz/dt=-x-x^3)...
Asked by Alebsleks1, Oct 19, 2018 03:53 AM in Physics
When an electron enters a uniform electric field at an acute angle, its trajectory is
Need Math Help!
Asked by SwaegSyub7, Oct 16, 2018 10:19 PM in Mathematics
You want to start a summer business to earn money. What will you do? You have to consider how much money you can afford to invest in this business,...
Asked by collinsdarkwah, Oct 15, 2018 05:58 PM in Physics
A train at station P accelerates uniformly from rest until it attains a speed of 100 km/h. It then continues at the speed for some time and...
Building Bylaws
Asked by rash1997, Oct 13, 2018 02:15 PM in Civil Engineering
Define the following pertaining to building bylaws: 1. Margin 2. Open Plot 3. Min area of a room
Directional derivative of exponential of a function
Asked by aboutammam, Oct 15, 2018 07:02 AM in Mathematics
Hello I have a question if it possible for a function f and a tangent vector field X of a manifold M, we have X(f)=∇_{X}f=<∇f,X> ...
How you can use vector sequences following insertional mutagenesis to identify..
Asked by Sylvia12345, Oct 14, 2018 11:30 AM in Biology
How you can use vector sequences following insertional mutagenesis to identify the site of integration in the genome? Hello all! I'm having...
Takeoff velocity question
Asked by wacky816, Oct 7, 2018 02:04 PM in Physics
A 139lb student lands from a vertical jump and immediately jumps vertically again. The average ground reaction force is 1345N which is applied for...
How can you convert 12v to 120 v
Asked by martinfreight, Oct 8, 2018 01:48 PM in Electrical Engineering
Looking at you tube videos how can I convert 12v to 120 v I know I need a transformer 120-6v and a relay,a 1uf capaciter,and a bridge rectifier what...
Radiant Barrier in winter?
Asked by prairielandman, Oct 8, 2018 09:40 AM in Energy
I just bought a radiant barrier to install in the attic to keep the heat out of the attic. I was thinking about this for the summer, but its already...
Confused & need help
Asked by kfcgod, Oct 7, 2018 10:17 AM in Physics
Iím gym class you run 22m horizontal then climb a rope vertically for 4.8m. What is the direction angle of your total displacement, as measured from...
Give an example of a partial order that is not a total order, and also give a topolog
Asked by mango09, Sep 30, 2018 04:26 AM in Mathematics
Give an example of a partial order that is not a total order, and also give a topological sort for this example.
Asked by Sairin aktar la, Sep 29, 2018 12:28 PM in Zoology
Economic importance of rotifers.
Physics Question- Centripetal force
Asked by alyssadarby18, Sep 21, 2018 01:35 PM in Physics
Suppose the coefficient of static friction between the road and the tires on a car is 0.513 and the car has no negative lift. What speed will put the...
Asked by Alex020293, Sep 15, 2018 10:47 PM in Physics
Attached are three problems (Advance physics related). I have worked them out. Can someone please tell me if it is correct. Thank you
Identificatin of a wasp
Asked by eitan, Sep 11, 2018 09:07 AM in Entomology
May the wasp in the attached picture be idedtified? Photo was taken in Israel, August 29 49052

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