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Physics: Post your doubts here!

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Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation :) thank you
 

asd

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Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation :) thank you
o_O Now that was totally random o_O
Okay, so I guess cause the smaller drop has less weight, so the force required by the air resistance to counter the weight is obv smaller now. It will take less time.
 
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Why does the small rain drop reach terminal velocity faster than a larger rain drop ? please give a detailed explanation :) thank you

mg of smaller raindrop< mg of larger raindrop, therefore it will take less time for resistive force to overcome the smaller raindrop hence reaches terminal velocity faster, (my thought)
 
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o_O Now that was totally random o_O
Okay, so I guess cause the smaller drop has less weight, so the force required by the air resistance to counter the weight is obv smaller now. It will take less time.
but the surface area exposed will also be less so air resistance will take more time to bring the drop to its terminal velocity.. nahi?
 
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Guys what about June 2002 on waves, (b.) part where it is a laser being diffracted in grating and made an angle of 162 and 136 degrees thing, I don't get it at all =(
 
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Can you explain me what are those angles? And why theta would be (1/2)(162-136)?
in diffraction grating its always a rule to divide angle by 2 in other questions of this type we r always given a single angle but here we r given side angles n we need to get the angle in between so 162-136=26 then 26/2=13 n then the usual way dsin(teta)=n(lambda)
 
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in diffraction grating its always a rule to divide angle by 2 in other questions of this type we r always given a single angle but here we r given side angles n we need to get the angle in between so 162-136=26 then 26/2=13 n then the usual way dsin(teta)=n(lambda)

But why is it then? Why the rule is like that =( ?
 
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7(b) the mark scheme said theta= (1/2)(162-136), why?
they have given it the other way round in the mark scheme
have u seen the repeated diffraction grating question in mcQs where diffraction grating angle is given as 70 but we use 35 cuz thts a rule to divide the angle by 2
 
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