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Physics Paper 5 tips

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Did u even try doing it????
I got answer correct by this way and verified by marking scheme.Constant dont contribute in the errors.
lets take t= 50 +- 0.2
error is 4%
and see dude using ur idea T = 0.5+-0.2 where error is 40%.hence idea doesnot matches. if we divide error by 10 we get same %error.it make my point more stronger.isnt it?
 
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Wasnot there a thread around here somewhere where people uploaded solved P5s and others gave feedback on them?
If yes, link please?
 
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Guys, can some one explain how a light gate works? Like for example is the right method:
When a rotating object connected by a rod to a pole, and we are measuring the time taken for one complete oscillation. A light gate is used. In order for this to work, the object passes through the light gate once, time t1 is noted. And when it completes one other oscillation time t2 is noted. So the time taken for one oscillation is t2-t1?
 
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