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plz help me in physics

J

joulie

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50
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Points
18
i have some doubts in nov/2012 13
q2- i thought heavier objects hit floor first
q10/q8-iam clueless
q13-i thought it is c
q18
q24-how come a part is reflected though it is much smaller than critical angle
q29-why isn't the answer carbon
q37-i thought it is radioactivity
 
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