How to calculate the amount of energy transferred through a food chain?

This is the food chain:
Plants- 11 000 J
Grasshoppers- 11 00 J
Mice- 130 J
Snakes- 12 J

The question is to calculate the energy in the grasshoppers that is transferred to the mice, in percentages.
How do I calculate it?
thank you!

Fart on a cheeseburger and eat it. It will pass you out and you will forget everthing from 48 hours. It won't bother you because you will forget about it

How to persuade the people in school to follow my energy saving plan?

this is a project I am doing how can i persuade people in my school to follow my energy saving plan? This is a seventh grade project ..

Please and thanks :)

Carrot and the stick. You can get a mule to move by tempting with food in front or by whipping the behind. I'm not in favor of the stick myself, but if you offer snacks or some reward for good behavior you might gain a following.

How to be an engineer that is related to making energy efficiency electrical products?

I've an engineering degree in Mechatronics but I do not know where I can apply.Should I take additional courses if I want to become one?please advise..thanks.

by their passion

How to prove that technology is not the solution for environmental problems?

I'm participating in a debate and the topic is "Is technology the solution for environmental problems?"
I should be speaking against the topic so my speech should be relating why technology is not the solution for environmental problems?
I have gathered few points on disadvantages of recent technologies but my whole speech cant be about only disadvantages.Can someone tell me another way,without the help of technology,how we can save our environment?

Thanks in advance.

You could use the facts... pick a tech event that happend in our past history.... invention of gas motor. That caused the huge need for fossil fuels. but if you were living then you couldn't have predicted how bad for the earth that this technology would be.. Now do we now what all the current tech will cause? No. So part of you arguement could be the unknown. whats hapening to bees? is it from cell towers? I am just using that as an exaple.

How to recycle the alluminium foils of medicines?

A lot of medicine are used in my house. And tablets covers are accumilated. What to do?

the foil is too small to recycle, chances are the recycling separators wont work on it. But if you scrunch it into a big ball, it might work.

How to dispose of jute bags in an environmentally friendly way?

My school got a shipment of about 260 customized jute bags and they were printed on the wrong color material. For PR purposes, we can't use them. We also can't donate them because they have the school's logo on them and they're not our colors. The company already sent us the new ones, but they didn't want us to return the old ones so now we are stuck with 260 bags that no one can use. What is an environmentally friendly way to dispose of these bags?

You don't need to worry, you can dispose them at any municipal bin, because it is a 100% biodegradable stuff so it won't hurt our environment.

How to calculate carbon emissions from electricity usage?

If I know how much electricity I have saved, how can I use that information to calculate the reduction in my carbon emissions/ carbon footprint?
I need to know this to do an experiment for a science project. Thanks

(Hmmm. I'm only allowed to edit my comments for 5 minutes. Boo!) There's other things to account for, including other devices on your network (printer, router, cable modem, perhaps a shared folder on some other computer), and then there's your portion of your ISPs infrastructure, including servicing the last mile to your house, as well as all their billing computers. You might reasonably argue your marginal use of these services don't count, thoughYou can probably find what mixture of power sources your power company uses. Once the power hits the high-voltage distribution grid it isn't really from that nuclear plant or coal plant any more.

How to measure solar output for a year before installing solar panels?

I need a device that I can setup to measure sun's output for a year, so I can see how feasible it is to have an efficient solar panel array in the area where I intend to install it.

Anybody knows one, and where I can buy it?

Hey Cinilak, you've got some good advice here. Roderick is right on the money, if you can find someone that has even a single solar panel on their house, or their property, I'd be quite surprised if they didn't want to spend the entire afternoon talking about it. The best advice you'll find in this technology is from someone who has first hand experience. That being said, we had a similar problem 12 years ago, and instead of buying or renting a solar pathfinder, we decided to install one 50 watt panel and a couple golf cart batteries and start making some of our own electricity instead. The idea was after a couple years of measuring how much our little panel generated, and comparing it to our utility companies monthly statements, it would be simple math to design exactly the system we would need. Well it worked like a charm, and as a bonus, we still have the little system making 12 volt DC power for led lighting, small electronics, a radio and night lights in our home. It still offsets about 5% of our homes usage, and provides us with a small backup source of lighting. You could find a 50 watt panel and some batteries for just a few hundred pounds. Home Power Magazine liked our idea so much they ran an article on it about 10 years ago. The magazine is worth subscribing to, and if you do, you can use their websites search engine to read the article right online, complete with wiring diagrams and so forth. Just look for, "Small System First," at their website. Grandad mentioned feed in tariffs. If you are planning on a larger system that ties directly to the grid, this is important. It determines how much your solar power is worth to the utility company if they buy it back from you. Any place that sells panels in your area should have information on this, it would be in their interest to be up to date, but they'll at least know where to send you if they can't answer the questions directly. Go get a sub to Home Power, do some more reading, and check out the sources below before deciding what to do. The device your were originally searching for is called a solar pathfinder, and there are ads for it in Home Power as well. It stands on a small tripod and measures solar "insolation" for several weeks or even longer to give you the data you are looking for. For the money, I still think we were better off just buying a panel and batteries, plus a few small instruments. Good luck Cinilak, and take care, Rudydoo

How to make a solar panel at home?

Can I make a solar panel at home?How to make it?

For solar thermal, its fairly easy. Build a flat metal box. (about 3" - 6" deep) I would reccommend a 5' - 6' minimum length (measured by how far your water will flow within the panel, in order to allow for enough heat gain when your water is flowing. Paint the surface of the interior of your box a flat black. At the top of the box install a tube to bring water into the box. Put small spay nozzles to evenly distribute water accross the surface at the top . Make a colleciton basin at teh bottom of your box to coeect the water being sprayed at the top. Get a clear glass panel to cover your box and seal it as best as you can. Mount your solar thermal box at an appropriate angle facing the morning sun. Best panel orientation depend on your geographjical location. You can search this for panel facing and elevation angle. For best efficiencies you will have to tinker some. If your water flow is too high you will not get the heat gain you desire. If you want a high volume flow you will need to gang multiple panels and trickle your flow across each panel. The collective flow on all panels will get you your desired flow rate. If this is for a swimming pool then you are done. If this is for your home you now need a thermal storage, like a hot water tank. You could pipe all input water for you traditional water heater thorugh the arrangement detailed above. The heater can then provide supplimental heat as needed during the night or cloudy days. Thgis will also give you a good thermally insulated storage. You can also add recirculation to keep the water in your hot water heater circulating thorugh the solar panel. This will help keep your water sotrage at your desired temperature. You can put a simple solar cell control on your circulating pump to only run it when the sun is up. A light sensor like those the street lights use... Last to help improve efficiency and reliability in your panel you can channel the water in your panel. for a trickle of water this could be done sy a simple brush application of thicker base paints whne you paint the interior of your box. The brush strokes will create distributed chanels helping to stop your water from aggregating and spread it out helpingwith the heat transfer. Remember to only brush up and down. Going side ot side will screw it up... Many other design options are avialable bu this, in my opinion, is the easiest to accomplish on your own. I hope you find this useful. I've seen these work very well...

How to find change in energy using liquid sodium?

Liquid sodium is being considered as an engine coolant..

How many grams of liquid sodium (minimum) are needed to absorb 2.90 MJ of energy (in the form of heat) if the temperature of the sodium is not to increase by more than 10.0 C?

Use Cp = 30.8 J/(K mol) for Na(liquid) at 500 K


Thank you!

sounds cool

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