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As physics p1 MCQS YEARLY ONLY.

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Marking Scheme says the answer is A but i am getting C
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In Nov 02 , q 32 , I got that the R at +1V would be 20 , but shouldn't the R at -1V be zero it's only a straight line and I think that downward straight line (infinite) is at -1.5V !!??
 
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L
0.5 x force x extension = 0.5 x 17 x ( 30 x 10^-2 )

CAN U PLZ ANSWER THIS
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Lets assume that XY is d , then we take the momentum in the clockwise and anti-clockwise directions which must be equal since the rod is in equilibrium . So , Fsin(30) * d = 10 * d/2 ,
F= 5 / sin(30) = 10 .
It's C then . :D
 
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Just divide the area under the graph into two trapeziums and the sum of their areas = the strain energy .
* Bear in your mind the units ( cm > m for the extension ).

dis method is a lengthy one :/ n wat abt the unit ?
 
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Lets assume that XY is d , then we take the momentum in the clockwise and anti-clockwise directions which must be equal since the rod is in equilibrium . So , Fsin(30) * d = 10 * d/2 ,
F= 5 / sin(30) = 10 .
It's C then . :D

which paper??
 
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