Please will you lovely people help me on some physics coursework.Watch
we have to explain why the mass of the potato, makes the cooking time increase. but you know, it has to be in scientific terms. any of you guys got an idea?
AND, when cooking a little cube of potato, what processes of convection, conduction, radiation are going on?
i really am clueless 'cause my science teacher is a ****** and i have my module exam next week and im gunna fail! if ANYONE could answer ANY part of my questions asap it would help me a lot.
thank you thank you thank you thank you thank you
I refuse to help anyone who keeps registering loads of new users with stupid names that are specific to one thread......soz
Well... I'd say..
Radiation - Radiation is how heat from the cooking element gets to the potato through air
Convection - When the air heats up it gets convection currents which causes it to move so the hottest air is at the top.
Conduction - Heat has to conduct through the potato to get to the middle of the potato - the bigger the potato, the more potato the heat has to conduct through to get to the middle so the slower it cooks.
The time increases because the more mass there is, the more energy needs to be transferred which takes longer. And the heat has to get to the middle.
Don't worry about the teacher - we're about to start a chemistry coursework with a teacher who doesn't seem to know what he/she's doing and constantly insults our intelligence (not mentioning any specific details, teachers use this forum)
well no actually, this is the first time ive signed up, and i just happen to hate science, and i have no idea what all you crazy people are about, so as i hate science, i thought of a random name. is that ok with you?
so if im cooking a little cube of potato in a beaker of water, then the heat from the bunsen buner will cause convection through the water, making the water heat up. that will then cause the potato to heat up, which does so by...conduction?
my science teacher talks little english lol.
My previous comment still stands....
Conduction is heat moving by particles heating up the particles next to it so it gets hotter throughout.
Convection is movement of heat by the hot water moving upwards.
So when you begin to heat your beaker of water the water the water at the bottom will get hot and move upwards because its density decreases. This means that that hot water will end up at the top. Colder water will move down the sides to the bottom and get heated up and move upwards. So you have this convection current where the water moves round in a circle being warmed up, moving to the top, cooling to a temperature below the water below it and moving back down to the bottom to be heated. Some heat might conduct through the water though.
My chemistry teacher speaks ok but doesn't explain stuff properly and kept an innocent little girl arguing for 20 minutes after school because she said the teacher wasn't explaining it properly and now the little girl has to go see the head of science tomorrow.