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Physics: Post your doubts here!

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Can someone please give me the answer for this question? The answer is A, right?
 

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Help please! :' I can not understand what happens when cells in a battery are wrongly connected like in the following 2 questions.Thanks in advance guys :)
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 2E and 3r

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

question 2)

20151122_120427 (2).jpg 20151122_120450 (2).jpg
 
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Can someone please give me the answer for this question? The answer is A, right?
Yea me too i think the answer is A as constant speed implies that acce=0
therefore 0=driving force i.e F _ opposing force i.e f
therefore f=F.
Can anybody confirm please
 
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Sketch graph with labelled axes to show how current through the wire will vary with p.d. across it if temperature increases as current increases.Can anybody help me out please
 
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Can someone please explain to me what do they mean by "use graphical methods to represent distance, displacement, speed, velocity and acceleration" (From Kinematics unit in the syllabus)?
 
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Can someone please explain to me what do they mean by "use graphical methods to represent distance, displacement, speed, velocity and acceleration" (From Kinematics unit in the syllabus)?

i think what they mean is that u sketch a graph of distance,speed , acceleration etc. :confused:
 
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nehaoscar i wud be incredibly great full if u cud solve question 12 and 21 frm p12 oct 2014 aswell , thank u !!!
12.
Take moments about the bottom left corner
clockwise = aniti-clockwise moments
Fh + Wa = 2Wa

21.
Strain energy is the area under the graph
Break the graph into sections and calculate the area
Remember to multiply the length by 10^-2 since it's in cm
 
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