Wave Phenomena Part 1

This video shows us constructive interference. Constructive interference is when two crest or two trough waves hit each other causing the two waves to become bigger and combine for a second then go back into two separate waves.

This video shows us destructive interference. Destructive interference is when a crest wave and a trough wave hit each other causing the wave to cancel out and become still just for a second then separate into two waves.

This video shows us standing waves. Standing waves is when two interference waves have the same amplitude and wavelength, causing the wave pattern and creates point where they cross called nodes.

Thermos Challenge

Our goal for this project was to create a thermos from cheap materials totalling to no more than $3. To create an efficient thermos, applications of our energy unit are necessary. Mine and Ethan’s thermos was simple and flawless in theory, to begin with, we took a Styrofoam cup and lined the inside with tin foil and created a lid out of tin foil and cotton fabric, these were the main functional components of the first prototype, as an additional aesthetic piece we painted it black. this thermos did not work well because it had a lack of insulation on the outside.

Considering the poor results of our first thermos we decided to ditch the aesthetic of the paint and replace it with more insulation because to us functionality was more important, we used the same lid but replaced the paint with a layer of foam underlay which was the best insulator available to us

Our second thermos was our best performing thermos but it had one key issue in the fact that it was over budget by 45 cents, so we exchanged some of the tin foil for a cutout from a pop can which was less reflective but way cheaper at the same time, the outer layer of the second one was perfect so we kept that largely untouched besides using some of our freed budget to insulate the top better, these elements left us with our third and final thermos.

Despite this being our final product it was not our best performing, but it was our most cost effective thermos, the next worksheets outlines what we used in and how we performed the testing experiments and the over all results of all 3 thermoses.

Now, the most important part, the theory behind our design and why we believed it would work. I think it is worth mentioning that our thermos was the best performing thermos that only used materials found in class when taking into account the over all price of our final product. Our design is simple and focuses largely on keeping the heat inside by using reflective and conductive materials, if the inner layer is able to conduct heat well it will create a system where the water heats up the foil and then in turn the foil does the same to the water. of course because of the laws of energy conservation this does not work that perfectly in practice because the water must share its energy with the foil to heat it up causing the water to cool down slightly, and the foil will also share its energy with the insulators. Due to these reasons you put the conductor on the inside because it takes less energy to change its temperature so the water will lose minimal energy creating stable temperatures, in turn you keep the insulators on the outside because they do not conduct energy well so they aren’t good at introducing the high energy of the inside of the thermos to the lower energy air outside. This is good because the hot water would balance its energy with the air faster if it had easier and more direct contact.

Foods Junk foods assignment

Image result for kit kat bar calories

My favourite junk food snack is a kit Kat bar. I like the chocolaty flavor on the outside and the crispy wafer it the inside. I also like the ways you can eat a kit Kat bar. You can either break it up and eat the whole thing at once. Some additives in a kit Kat bar are polyglycerol polyrincoleate (PGPR) and soy lecithin. PGPR and an emulsifier that reduces the need for the amount of coca butter and slows down the frictions of particles in the chocolate. Soy Lecithin is also a emulsifier but some believe it carries potential health dangers. The ingredients in a kit Kat bar are Milk chocolate (sugar, modified milk ingredients, cocoa butter, cocoa mass, whey powder, lactose, soy lecithin, polyglycerol polyricnoleate, natural flavor), wheat flour, sugar, modified palm oil, cocoa, sodium bicarbonate, soya lecithin, yeast, Natural Flavor). when I’m at a store I’ll will usually get on bar or if I’m really craving so e chocolate I will get the package with two kit Kat bars. Their are 510 calories in one serving (one whole bar) of a kit Kat bar. This foods isn’t the healthiest because it has a lot of calories in just one serving and it also has 26g of fat in it as well.

https://en.wikipedia.org/wiki/Kit_Kat

https://www.google.ca/search?q=kit+kat+bar+calories&source=lnms&sa=X&ved=0ahUKEwiW9qaCqbHUAhUU-mMKHZKVBJIQ_AUICigA&biw=1366&bih=622&dpr=1#spf=1497030712664

http://www.healthline.com/health/food-nutrition/is-soy-lecithin-good-or-bad-for-me

https://en.wikipedia.org/wiki/Polyglycerol_polyricinoleate

 

Chili Cook over reflection

Ethan, Naomi, Claire, Alyah

Sweet and spicy chili

Chili chimps

Day 1:

We looked at different types of chili recipes. We found a chili recipe with pineapple as a special ingredient to the chili. After we copied the recipe and started to fill out the chili cook-off form. Naomi came up with our group name.

Day 2:

On day 2 we dem. the cheese braid and started to plan who was bring food from home and we finished writing our grocery list and handed it in.

Day 3:

On day 3 we started to cook our chili. Naomi and I chopped up the peppers and the onion. Alyah was cook the ground beef and Claire was opening up the can with the pineapples, diced tomatoes etc. After every was chopped up, the canned ingredients and the powder/species were measured we added all of it and began to cook everything up then we cleaned up and put the chili in the fridge

Day 4:

On day 4 we made the cheese braid, let the chili simmer to warm it up and talked about how we would present it. After the cheese braid was done baking we put the chili in small bowls, added some sour cream on top, put a little bit of parsley on the sour cream and cut the cheese braid into triangles and served. After we presented ours we ate the rest then cleaned up the left.

Stretch the kitchen

 

We decided to make a apple crumble for our lab this week. We substituted cinnamon for nutmeg and butter for margarine. Overall this went really well everybody helped put with the process and the finish product was good. I think for next time we would use bigger apples as the ones we used today were rather small, also I think I would use sweeter apples. We were definitely happy with the actual crumble, it was crunchy and sweet and warm.