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Author Topic: Physics Help HERE ONLY !!  (Read 80982 times)

nid404

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Re: Physics Help HERE ONLY !!
« Reply #75 on: May 24, 2009, 11:58:03 am »
u need add to the weight of the disc too. 1kg=10N, so 200+300+200(of the disc)=700g
which is 7N i believe

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nid404

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Re: Physics Help HERE ONLY !!
« Reply #76 on: May 24, 2009, 02:13:25 pm »
yup depends on the weight uve chosen.

F=m*a(m in kg)

since masses here r in grams u need to convert them to kg and then multiply by ten.
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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #77 on: May 24, 2009, 02:17:00 pm »
correct...i forgot Kg...tks,,
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nid404

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Re: Physics Help HERE ONLY !!
« Reply #78 on: May 24, 2009, 02:17:52 pm »
never mind ;)
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Offline Enia

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Re: Physics Help HERE ONLY !!
« Reply #79 on: May 25, 2009, 12:35:05 pm »
Hi. So I had a few questions.

Can anyone please explain the AC generator for me? And also why is the direction reversed every half turn and how does that happen.

Also:

Can you tell me what we are supposed to write in questions where they ask about energy changes that take place? For example for a cart traveling down a ramp and then back up (since the ramp is curved, like skating ramp thingies) Where are we supposed to stop? Like do we also mention sound or just heat and kinetic energy and gravitational potential energy?

Thanks!  :)
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #80 on: May 25, 2009, 12:43:03 pm »
Quote from: Enia on May 25, 2009, 12:35:05 pm
Hi. So I had a few questions.

Can anyone please explain the AC generator for me? And also why is the direction reversed every half turn and how does that happen.

Also:

Can you tell me what we are supposed to write in questions where they ask about energy changes that take place? For example for a cart traveling down a ramp and then back up (since the ramp is curved, like skating ramp thingies) Where are we supposed to stop? Like do we also mention sound or just heat and kinetic energy and gravitational potential energy?

Thanks!  :)
Ac generator
It consists of a recangular coil of wires that is mounted on an axle by turning the axle the coil is made to rotate between the poles of perminent magnet
as the coil rotate the magnetic field thorugh the coil changes and therefore induced EMF between the end f coil
the slip rings allow tthe transfer of the alternating current emf induced Each ring is connected to one end of the CIL WIRE ELECTRICALLY CONNECTED BY CONDUCTING CARBON BRUSH
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Offline asus

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Re: Physics Help HERE ONLY !!
« Reply #81 on: May 25, 2009, 02:07:27 pm »
help me out with ppr 3 nov/03..
6 (b)...
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #82 on: May 25, 2009, 02:15:52 pm »
Quote from: asus on May 25, 2009, 02:07:27 pm
help me out with ppr 3 nov/03..
6 (b)...

speed = freqnecy  * wavelength
speed  / frequency = wavelength


3x10^8/5*10^14

Hope u understand  :)
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Offline asus

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Re: Physics Help HERE ONLY !!
« Reply #83 on: May 25, 2009, 02:21:27 pm »
Quote from: ManaH on May 25, 2009, 02:15:52 pm
Quote from: asus on May 25, 2009, 02:07:27 pm
help me out with ppr 3 nov/03..
6 (b)...

speed = freqnecy  * wavelength
speed  / frequency = wavelength


3x10^8/5*10^14

Hope u understand  :)
ermm..i know how to do that..
but..i don't think the answer same as the markschme...
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #84 on: May 25, 2009, 02:23:57 pm »
Quote from: asus on May 25, 2009, 02:21:27 pm
Quote from: ManaH on May 25, 2009, 02:15:52 pm
Quote from: asus on May 25, 2009, 02:07:27 pm
help me out with ppr 3 nov/03..
6 (b)...

speed = freqnecy  * wavelength
speed  / frequency = wavelength


3x10^8/5*10^14

Hope u understand  :)
ermm..i know how to do that..
but..i don't think the answer same as the markschme...

lemme cheak it
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #85 on: May 25, 2009, 02:30:18 pm »
its wierd bcuz tey say the formula which i am using n then when u substitue the value the answer is totally differenf :-\
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Offline asus

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Re: Physics Help HERE ONLY !!
« Reply #86 on: May 25, 2009, 02:30:52 pm »
but why the ms says 6 x 10 m  ???? ??? ???
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #87 on: May 25, 2009, 02:34:07 pm »
Quote from: asus on May 25, 2009, 02:30:52 pm
but why the ms says 6 x 10 m  ???? ??? ???
i really dont know :S
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Offline MaNa

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Re: Physics Help HERE ONLY !!
« Reply #88 on: May 25, 2009, 02:55:04 pm »
i guess the mark shceme is wrong
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Offline asus

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Re: Physics Help HERE ONLY !!
« Reply #89 on: May 25, 2009, 03:13:21 pm »
Quote from: ManaH on May 25, 2009, 02:55:04 pm
i guess the mark shceme is wrong

yaa..i think so..
but our answr is correct rite?..
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