Edexcel IGCSE Physics Exam 20th May 2015

Original post by chazer154

And did you get 10 or 17 for the velocity time graph on the bus?

It's 10

Reply 81

Original post by chazer154

I put:

- the toaster could burn the skin and if a conductor (eg knife) was put into the toaster to try and get the bread out, it could give you an electrical shock as it would touch the resistors carrying the voltage therefore is dangerous.

- if the shielding broke in the microwave, it could send the microwaves out and heat human body tissue, causing danger.

- water could get from the tap or the dishwasher into the plug, causing an electric shock.

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I came from That angle saying a kettle could burn you'd ur to electrical supply heating up water supply. iron turns electrical energy into heat which can burn you and that. Toaster can cause a fire or electric shock if you touch inside of it with a knife etc.

Reply 82

Original post by Phutile

Sounds good, I originally wrote that the water supply could mix with the electrical supply, but I thought that was too far fetched. In my opinion, these questions were far, far too obscure, and there are at least 25+ answers to it. Only one issue with your answers, and this isn't even wrong, just the phrase "causing danger". It's technically correct, as danger means "the possibility of bodily harm or injury", it just sounds a little off. Overall though, that's good.

Exactly the same as me

Reply 83

The hardrive a is to do with energy output apparently, less heat is lost in the black as it is absorbed rather than reflected meaning that less energy is required for them to work. Less energy results in less heat energy or something along those lines. Black on top means that the whites hear is absorbed by the black and not given off whilst if white is on top then the ehites hear radiates into the atmosphere. Mark scheme should look like:
Mp1 : black absorbing white reflecting
Mp2: contact with floor, more exposed
Mp3: explanation why
Mp4 : less absorbed, more absorbed etc.
Mp5: reference to radiation
Anybody have any other points?

Reply 84

Oh and did anybody use an oscilloscope with two microphones for the speed of sound as most people used a clap and starting when seeing stopping wen hearing

Reply 85

Original post by Ewarwoowa

The hardrive a is to do with energy output apparently, less heat is lost in the black as it is absorbed rather than reflected meaning that less energy is required for them to work. Less energy results in less heat energy or something along those lines. Black on top means that the whites hear is absorbed by the black and not given off whilst if white is on top then the ehites hear radiates into the atmosphere. Mark scheme should look like:
Mp1 : black absorbing white reflecting
Mp2: contact with floor, more exposed
Mp3: explanation why
Mp4 : less absorbed, more absorbed etc.
Mp5: reference to radiation
Anybody have any other points?

I think I got full marks if you read my above answer then...

Reply 86

Original post by Ewarwoowa

Oh and did anybody use an oscilloscope with two microphones for the speed of sound as most people used a clap and starting when seeing stopping wen hearing

I thought you could only use the stopwatch.

Reply 87

username1955077

1

it was fine , i am actually confused , i dont know it was good or not , but i can say it was definitely better than expected
the last ques was really weird and the hard drives one also was confusing
overall it went pretty good
i still hope grade boundaries are low xD

Reply 88

Original post by Phutile

I thought you could only use the stopwatch.

You can use a stopwatch to time howblong it takes for the second line to appear

Reply 89

So I've paranoia to the next level and emailed my physics teacher about the kitchen question.. answers soon I hope.

Reply 90