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Physics: Post your doubts here!

qwertypoiu

qwertypoiu

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nehaoscar said:
That's what i thought as well like always take the powers
but then in the first paper they're not using the power... is it something to do with logs?
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Unlikely to do with logs. It's simple scales. Powers of ten simply prevent having to like long decimals like 0.0035
 
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ahmedish

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Abdulrab said:
Re: Physics Help here! Stuck somewhere?? Ask here! :)

Can anyone tell me what should i learn for pressure in lquids for As level and please give me the detailed explanation of viscosity in liquids asap !!! thanks
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viscosity is not in the syllabus, download the syllabus from the cie guide and read what u want
 
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Shujaat Khan

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nehaoscar said:
View attachment 57071
Why is q negative for the first row?
no thermal energy is supplied to the system since it's constant temperature right so then why zero??
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Sorry for late reply you might have already got the answer but just in case I'll explain it.
For an ideal gas, Internal energy is proportional to Temperatuer.
Since temp= constant, Change in U=0
According to first law of thermodynamics, Q-W=0
Therefore, Q=W
Meaning all the heat added to the system is used to do work( thats why the -ve sign at q and +ve sign at w)
 
nehaoscar

nehaoscar

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Shujaat Khan said:
Sorry for late reply you might have already got the answer but just in case I'll explain it.
For an ideal gas, Internal energy is proportional to Temperatuer.
Since temp= constant, Change in U=0
According to first law of thermodynamics, Q-W=0
Therefore, Q=W
Meaning all the heat added to the system is used to do work( thats why the -ve sign at q and +ve sign at w)
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Thankyou! And better late than never :) I had actually almost forgotten about this question and hadn't found an answer :p
Thanks!
 
Rectified Spirit

Rectified Spirit

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A whole hearted thanks to smzimran the notes were very organized, hope it will be helpful for my upcoming exam..........
 
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Shujaat Khan

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ahmedish said:
how many s.f should my answers be in paper 2? i always see 2 s.f in final answer and i use 3
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Either 2 or 3. They only penalise if you write to 1sf or to more than 3sf( unless specified in the question)

This statement does not apply for uncertainty questions!
 
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