How to make a solar cooker boil water?
I need to make a solar cooker for a science project and i NEED to make it boil water. I know that i need to use aluminum foil and im using insulation and plexiglass to make it hotter inside. Everything is painted black to absorb more heat. And i have to use a soda can 16Oz with 100mL of water in it.
Im wondering what is a realy good way to make it boil?
Answer:
Paint the can flat black so the can is what absorbs the heat. Reflect as much light as you can onto that can. Use the Plexiglas to reduce conduction and convection by airflow, and to prevent the escape of infrared radiation.
How to get from kilo-watt hours per year to kilowatts per hour?
If a dishwasher uses 303kwh per year , how much is that per hour?
Answer:
"kilowatts per hour" is a totally meaningless statement, sorry. watts is already a rate, one watt = 1 joule per second. OR, 1 kW = 1 kW-hour per hour.
Perhaps you want kW-hour per hour? Which is the same as kW?
dimensional analysis
303 kW-hour / year x (1 year / 365 day) x (1 day / 24 hours) = 0.0346 kW-hour / hour
or 35 watt-hour / hour
or 35 watts (average power used)
How to stop chicken Bones from smelling for jewelry?
I am using some bones from a cooked meal, so i already had a head start on drying them out. Once i had chosen the bones i wanted, i put them in the oven for 4 hours on a high temperature.
When the bones were dry, i washed them and sanded them to scrape off the excess meat and whatnot and attached them to a necklace, but i noticed they still smell pretty bad, sorta like dog treats or something.
How can i get the smell to go away?
Answer:
Put them out in the sun for a few days, preferably in a place that's inaccessible to raccoons and cats. If you must cover them, use a screen, not a glass bowl - glass is opaque to ultraviolet light, which is what does the job - it breaks down the organic chemicals you are smelling. You can also try spraying them with Febreze - it contains chemicals called cyclodextrins (distant relatives of sugar) that trap other molecules, preventing you from smelling them even though they're still there. I don't know how long Febreze will last. Try the sun first - it fixes the problem rather than masking it, and it's free.
How to make up iodide solutions of different concentrations?
I'm given potassium iodide crystals (KI) and iodine solid and have to make up different concentrations of iodide solutions to later react with propanone and hydrochloic acid to follow with colorimetry. I really have no idea what to do!! Any help will be greatly appreciated!
Answer:
I find it difficult to believe that you have not been given proper instructions for making up these solutions, especially since potassium iodide is a skin irritant. Ask your teacher or lab supervisor.
How to spot indications of white noise in random walk residual plots?
I'd like to know how you can see if a residual plot in a random walk model has white noise? I have googled and read about white noise but I'm having a difficult time actually pointing out which of my 6 plots have white noise.
Anyone care to help me out?
Answer:
The white noise will show up in the thickness of the line you can draw through the plot without obscuring real data.
How to land a fall without hurting yourself?
If you find yourself falling, or having to jump off a high height, let's say thirty feet, onto a moderately hard surface, let's say gravel, how do you minimize injury upon landing? People have fallen off of roofs and other tall structures and walked away. Is there a way you can position yourself to receive the least damage? Is there a difference between falling on a flat surface and a slope?
Answer:
Your best bet is doing a roll, you can learn it through a Parkour tutorial, they're very effective for reducing damage to your body from great heights.
http://www.ehow.com/how_2189171_parkour-roll.html
You have to be very good at this though. Falling onto a slope will reduce stability and increase your momentum when you make contact with the ground, making it more dangerous.
Here's a tutorial on how to do it:
http://www.ehow.com/how_2189171_parkour-roll.html
Hope this is all theoretical :P as it's not recommended.
Also, here's a video on some people intentionally jumping from great heights and landing successfully. :)
http://www.youtube.com/watch?v=uNBPQe4dFxk
