Solar Definition and 1000 Threads

Hello my friends, first I want to thank all of those who take their time to helping people like us. I have a question and is what is the most recent guide on making a very powerful Solar Cell, I am very interested in it, and the reason why I want to know this is for making more devices to cut...

My mom has a Texas Instruments TI-36 Solar calculator. A few days ago I found that there are functions for calculating combinations and permutations. The trouble is I can't seem to figure out how to use them.

Homework Statement A solar collector has an effective collecting area of 12 m^2. The collector is thermally insulated, and so conduction is negligible in comparison with radiation. On a cold but sunny winter's day the temperature outside is -20.0 C, and the Sun irradiates the collector with...

so I am testing out different designs on a nitrogen laser, and wanted a quick way to test whether or not one design had a more intense output than the other. without having to buy a sensor, my idea was to direct the beam onto a solar cell, then measure the output current. higher current wud mean...

I was wondering how long it takes to heat up materials. And how long will they hold their energy? Say for like thermal energy storage, how long does it take to heat up molten salts or other substances with sunlight? I guess I could just use Q=mcT and divide by time and then solve for time...

Those of you living on the moon will see a rare sight tonight, a total solar eclipse. Not coincidentally, the entire US, and very little where else will see a total lunar eclipse. This will be one to tell your grandchildren about since there won't be another until June 15, 2011. Don't look...

Good day All, Just a quick question: The sun emits charge particles, very hot moving very fast, right? (stop if my knowledge is incorrect :smile:) What will happen if one can cool down and / or slow down said particles? TX

I am a 4th year Phy UG on a 5 yr plan and need some advice, these two courses overlap so I can't take both. I am interested in both topics but have more background in astrophysics, not much in the engineering area. I guess my indecision stems from a larger crisis I am having in trying to...

At time T(sunrise) the SHA = -81.361029147899785, which makes frac. hours to noon (SHA / 15.0). Is calculating the time of astronomical twilight to noon as simple as (SHA - 18) / 15.0?

Homework Statement trying to show that the units W m-2 are equivalent to kg s-3 Homework Equations 1 W = 1 J s-1 ? The Attempt at a Solution energy per unit time? p.s. I am very new to physics, a beginner in understanding the whole concept of units, any advice?

Hi, I am trying to create a program (3D simulator) that reproduces the Solar system's behaviour. In this idea, I am using Newton's first and second laws: F = G * m1 * m2 / ( r * r) a = F / m I already managed to create a stable system containing the Sun, Earth, Jupiter and other...

Hello. I was wondering about something the last few weeks and that is if the solar wind can affect communication systems between satellites. I am not referring to the physical damage that the solar wind might produce to the satellite, but the interference it might have on the radio signal that...

Greetings, I'm seeing programs that allow solar, wind and other types of power generation to be connected to your house (or business) and you are still connected to your grid. The power company meters both - what they provide to you and what your private generation provides. Your power...

School experiment: Shine lamp at a solar cell, and measure the voltage using a multimeter. Independent variable is the distance between the light bulb and solar cell, dependent variable is the voltage. What is the relationship between the two? And how exactly do I prove it? What I have...

I just noticed an item in Ned Wright's "News of the Universe" about a new determination of the solar system's speed. It is roughly what we've been saying, around 370 km/s in the direction of constellation Leo, but this paper determines it with increased precision...

Hi, I am a non physicist/astronomer and having a little difficulty navigating definitions. Apologies if the question has already been covered elsewhere. If I calculate the RA/ Dec of say, the sun, on a certain date and time, how do I find the lat/long of the point on the Earth's surface...

Why don't galaxies for giant "solar systems"?

Homework Statement (a) What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit? Homework Equations Kinetic Energy=Potential Energy 0.5mv^2=rGM/(r^2) 0.5v^2=GM/r Where M is the mass of the sun, and r is the...

what will be the difference if the solar panel will be directly connected to the 12 volt battery or the solar panel is connected to a switching regulator before connected to the battery..which is faster to charge?..and what will be the difference in terms of power transfer?

hello! Hope you all will be at quiet ease. I am looking for the guidance to observe the performance analysis of MPPT (Maximum power point Tracker) in parallel and series configuration with similar solar modules. I have two solar modules each having the following rating: - Maximum power...

Is our solar system either closer to or farther from other solar systems in our galaxy compared with the average distance of one solar system to another? Thanks, Jake

Hi..I joined this forum a couple of days ago and I find that this is the best place for newb like me to share and seek some ideas. I have a question to ask and I don't know if this had been asked before. Would it be possible to heat water to its boiling point by solar? The idea is to...

We have a model where we are to predict the temperature of the water outlet stream of a storage tank. Basically we have a solar heating collector that heats up a fluid which is present in a storage tank. The flow process is that the fluid flows through the pipes to the solar collector and back...

how can i obtain a thermophotovoltaic device to convert solar heat from a parabolic reflector to electricity? or is there any other better device that can convert heat directly to electricity?

First of all, if this should have went in the Engineering section, I'm sorry... I wasn't sure where to write this post. If a solar panel on Earth's surface can gather say 100W/m^2 in full sunlight, how much would the same solar panel be able to gather in space, outside of Earth's atmosphere...

hello, our team has a solar car project, and i am in charge of the solar array system. Now we have an average silicon solar cell of Voc 0.6 V and Isc 6 A, thus 3.5 W of power. We are given 6 sq. meter of area to cover with solar cells. This corresponds to around 2300 standard sized solar...

If a black hole is approaching towards our solar system, at what point could it be detected and is there anything we could do to avoid catastrophe? Would it make more sense to attempt to move the Earth in such a situation?

A letter in the current issue of Nature: ==quote== A two-solar-mass neutron star measured using Shapiro delay P. B. Demorest1, T. Pennucci2, S. M. Ransom1, M. S. E. Roberts3 & J. W. T. Hessels4,5 National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, Virginia 22093, USA...

Everything is on the same plane, and I was wondering why. I mean like, if you laid a reallllly flat and thin plate out, then everything rotating around the sun would fall in that, I mean the planets, not comets or whatever.

I'm working on a solar radiation project. I was able to design a homemade pyranometer, yet I'm trying to establish what the sample rate should be. After reading several pdfs I set 60 seconds as my sample rate and I have good results, I mean if I choose 10 seconds instead I just get a lot of...

Since the Earth's magnetic field helps to protect the Earth from a lot of the suns harsh treatments, do we also assume that in some degree light is also (possibly in very small fractions) also diverted by the magnetic field? If no, would it even be possible to assume that a very strong...

Hey guys, I am a complete beginner in the field of electrical engineering so please bare with me in this discussion. It is my understanding that; 1) The Earth absorbs 3,850,000 exajoules in solar energy every year, which means that if we could harness even 50% of the suns power for just one...

And goes directly through Oregon. Woohoo! http://eclipse.gsfc.nasa.gov/SEgoogle/SEgoogle2001/SE2017Aug21Tgoogle.html

Is it just because the moon moves in and out of view quicker than the Earth moving in and out of view as to a lunar eclipse? I can't find a simpe definition out there? Thanks!

The question I have is: Assume a 100 kg reflective load with 1m2 area at a distance of 1 million kilometers from the surface of the sun. If the sun’s temperature is 6000K and radius is 695,000 km, find the radiation pressure exerted on the object. Find how far the load would be from its...

Homework Statement 1m wide solar heat collector that is x long. Find the temperature as a function of x. 500 W/m^2 transferred from the collector to the air within the collector, 100%. Air enters the collector has the following properties: cp = 1000 J/(kg*K) m = 0.02 kg/s...

I was perusing an astronomy homework site and came across a question in which they are asked to plot the positions of the 3 inner planets on polar graph paper. They are then asked questions about visibility and time of day in Earth's sky. The table: [FONT="Courier New"] Location Venus Earth...

http://www.politico.com/news/stories/1010/43156.html#ixzz11VnCzznc I wasn't sure if this discussion might go nowhere, political, or towards energy, so GD is it for now. While I didn't like Carter as a leader, he had the right ideas. I don't know if the original system made sense or not...

Hi Guys I m thinking of making a Solar air compressor ie heating air in a closed vessel ( constant volume heat addition) using parabolic reflectors etc till reaches an optimum pressure At this point a check value opens, and the the pressurised air is made to pass through a heat exchanger (...

(I would've put this in the homework section except it didn't follow the template.. :P I'm really sorry) For a Science Fair project I want to make a portable energy source with solar panels. I'm thinking of making a cube of panels with the deep cycle battery within the cube. Then to make it...

So I'm not the most knowledgeable person when it comes to electrical connections and the like but I tend to have a fair idea. I'm currently planning on building a solar panel with the hope that it will power appliances throughout my house. My planned set up is as follows: >> 36 0.5V 3.6A...

Fabrication of Single Junction GaAs Solar Cell by MBE Hi All, My project is to produce 1 single piece of GaAs solar cell (about the size of 1cm square) by MBE technique. I have gone through some read up and simulation software software called atlas by silvaco. for time being, I am testing on...

[b]1.I need to create an electronic system that automatically can measure and derive the IV and I-P characteristics (graph) and it must show maximum power point on the graphs. [b]2.The system must include a homemade voltage controlled electronic load that can load the solar cell with a well...

Can you please suggest me some books to read on this topic? It's for my final year project! I would much appreciate it!

I just discovered about solar storm named "Carrington Event"; I'd like to know how such a solar storm could affect my PC today. I found some publications: http://www.bu.edu/csp/EMMREM/papers/carrington.pdf...

Hi everyone Does anyone know of any source where the total amount of iron in the solar system has been estimated? Free iron, isotopes, oxides, etc. I've been reading here and there about element abundance on Earth and in the cosmos, and am curious if solar percentage of iron is...

Estimate the radius of a solar mass (2 × 1030 kg) black hole. How do I do it? I have literally no idea! Thanks in advance for any help.

I am trying to develop a btu calculator for my solar thermal water heater. I would eventually like to use labview to do the acquisition. I have an internal heat exchanger and know the temperature before and after it enters the exchanger. I have a flow meter w/ a pulse output. What would the...

So I was looking at my parent's power bill today because they've been complaining the bill is so high. I looked and as I knew for years, we get killed when we go pass what PG&E calls "300% over baseline". We live in the central valley in California where temperatures get to be up to 110 and that...

If a solar eclipse is visible near the equatorial region on the Earth, does it move from West to East at about 1000 miles/hr?