Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
Hypernova:
--- Quote from: Dania on November 06, 2010, 10:42:40 am ---Help!
The mark scheme answer is so vague. I don't get it.
--- End quote ---
Understand that the weight of the body may be considered to act at its center of gravity. Weight is a force, so if it acts about a pivot it will cause a turning effect.
We know that the carboard comes to rest, therefore we conclude that there is no turning effect.
The only time there is no turning effect is when the weight acts through the pivot.
Think about it like this...moment=F*d...so if d=0, then there is no moment.
The only force on it is weight, and weight acts through the pivot, then say there is no resulting moments.
Deadly_king:
--- Quote from: Hypernova on November 06, 2010, 11:13:51 am ---Understand that the weight of the body may be considered to act at its center of gravity. Weight is a force, so if it acts about a pivot it will cause a turning effect.
We know that the carboard comes to rest, therefore we conclude that there is no turning effect.
The only time there is no turning effect is when the weight acts through the pivot.
Think about it like this...moment=F*d...so if d=0, then there is no moment.
The only force on it is weight, and weight acts through the pivot, then say there is no resulting moments.
--- End quote ---
Thank you very much dear member for your help :)
It's a real pleasure to have you here. :D
+rep
Deadly_king:
--- Quote from: Hypernova on November 06, 2010, 11:01:01 am ---Here.
<a href="http://tinypic.com?ref=2wpqs09" target="_blank"><img src="http://i51.tinypic.com/2wpqs09.jpg" border="0" alt="Image and video hosting by TinyPic">[/url]
--- End quote ---
That's exactly what I meant Dania. ;)
Dania:
--- Quote from: Hypernova on November 06, 2010, 11:13:51 am ---Understand that the weight of the body may be considered to act at its center of gravity. Weight is a force, so if it acts about a pivot it will cause a turning effect.
We know that the carboard comes to rest, therefore we conclude that there is no turning effect.
The only time there is no turning effect is when the weight acts through the pivot.
Think about it like this...moment=F*d...so if d=0, then there is no moment.
The only force on it is weight, and weight acts through the pivot, then say there is no resulting moments.
--- End quote ---
Thank You! That was very helpful.
Dania:
Okay, so I seem to be stuck on (b) [Refer to the attachment]. Would I use the equation "Phase angle = 2(pie)x/lambda"?
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