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- Thread starter XPFMember
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Ty soooo much <<<<<3333hellen here you go but don't depend on them as they are so much summarised!

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View attachment 57657 Please ! Some one help me solve this (Question 21) I have a test tomorrow

is the answer B?

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PLZ help me to calculate absolute uncertainties for T^2 .. actually i have just started p5 .. View attachment 57656

I think its this equation,

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Just remember to use P=v^2/R or P=I^2/R when its asks for power dissipated.

also remember that every resistor are the same so they all have the value of 38.4 ohms

Resistor in Series are added while Resistor in parallel are inversed than added.

and also know that current prefers the least resistive path... such in case of ( Closed Closed Open).

Now try to solve it by yourself . If you cannot understand than feel free to contact.

yep i kinda got it.. thnx

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Thanks a lot .. PLZ also help with this one to calculate uncertainty !

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''For the greatest efficiency the external resistance must be much greater than the internal resistance of the cell. However, for the maximum power to be delivered to the external circuit the internal resistance must be equal to the resistance of the external circuit, although the cell will only be 50% efficient.''

Why should the cell be 50% efficient but not fully efficient please?

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when length decreases,resistance also decrease according resistance=resistivityXlength/area,right?

Then how come the answer is E?Maybe i can't understand the question itself.Help please!!

Thanks in advance

see solution 839 atView attachment 57678 When strain is increased,it implies that length decreases according to strain=extension/length

when length decreases,resistance also decrease according resistance=resistivityXlength/area,right?

Then how come the answer is E?Maybe i can't understand the question itself.Help please!!

Thanks in advance

http://physics-ref.blogspot.com/2015/06/physics-9702-doubts-help-page-167.html

both at same time. only the vertical motion determines the time of fall. the conditions are the same for both.Can someone please give me the answer for this question?

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Thanks I totally understand it now

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Question 1 )

Five cells of emf E are connected in series each having internal resistance r. if due to oversight, one cell is connected wrongly, then the equivalent emf and internal resistance are

[a]3E and 5r

[c] 4E and 5r [d]5E and 3r

question 2)

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Yea me too i think the answer is A as constant speed implies that acce=0Can someone please give me the answer for this question? The answer is A, right?

therefore 0=driving force i.e F _ opposing force i.e f

therefore f=F.

Can anybody confirm please

gradient = speed. so, where the gradient is zero. that's at the peakAt which point does the body comes to momentarily rest?