Author Topic: ALL PHYSICS DOUBTS - POST HERE !!  (Read 225664 times)

Offline Shazizzzle

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1710 on: May 26, 2010, 09:43:02 am »
A force acts on a moving rubber ball.
How many of the following changes could happen to the ball because of the force?
• a change in direction
• a change in shape
• a change in mass
• a change in speed
A 1 B 2 C 3 D 4

the answer is C which is 3 but i didnt understand why??

3, because, A force CAN change the direction, shape, and speed, BUT a force CANNOT change the mass of an object.
Recall forces.
So...
Only 3/4 are correct, thus C.
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Offline SoONa

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1711 on: May 26, 2010, 09:43:56 am »
3, because, A force CAN change the direction, shape, and speed, BUT a force CANNOT change the mass of an object.
Recall forces.
So...
Only 3/4 are correct, thus C.

Thanks A million  ;D

Offline Girlie45

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1712 on: May 26, 2010, 09:46:45 am »
a neutron spilts into a proton and an electron, the electron is emitted.

so no. of neutrons decreases by 1, and no. of protons increases by 1.

Thanx! By the way liking the stewie pic  ;D hahaha

Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1713 on: May 26, 2010, 09:48:04 am »
In Nov 93 number 19
http://www.freeexampapers.us/IGCSE/Physics/CIE/1993%20Nov/0625_w93_qp_01.pdf
It says which diagram shows the diffraction of a wave going through a wide gap.
Isn't it C? The one that shows the waves slightly bent at the ends, and not D as the mark scheme says, which shows perfectly curved waves??  ???

Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1714 on: May 26, 2010, 09:48:37 am »
Thanx! By the way liking the stewie pic  ;D hahaha

STEWIE GRIFFIN FTW!!!!
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Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1715 on: May 26, 2010, 09:50:37 am »
In Nov 93 number 19
http://www.freeexampapers.us/IGCSE/Physics/CIE/1993%20Nov/0625_w93_qp_01.pdf
It says which diagram shows the diffraction of a wave going through a wide gap.
Isn't it C? The one that shows the waves slightly bent at the ends, and not D as the mark scheme says, which shows perfectly curved waves??  ???

Should be C. Incorrect MS?
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Offline haris94

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1716 on: May 26, 2010, 09:51:27 am »
In Nov 93 number 19
http://www.freeexampapers.us/IGCSE/Physics/CIE/1993%20Nov/0625_w93_qp_01.pdf
It says which diagram shows the diffraction of a wave going through a wide gap.
Isn't it C? The one that shows the waves slightly bent at the ends, and not D as the mark scheme says, which shows perfectly curved waves??  ???

i think its C
the gap is wide
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1717 on: May 26, 2010, 09:51:48 am »
Should be C. Incorrect MS?
I dno :/ how can I tell?

Offline 8T

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1718 on: May 26, 2010, 09:52:20 am »
u should get 6.4*10^5 with converting to m3 and without converting
ms must be wrong
So can u do the conversion and show me please because i keep getting 6.4 ??
In both with and without???
Thanks
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1719 on: May 26, 2010, 09:53:04 am »
Should be C. Incorrect MS?

I agree.  The gap is wider than the wavelength, so yeah totally agree it's C.  It's not the proper mark scheme anyway.
Always willing to help!  8)
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1720 on: May 26, 2010, 09:54:16 am »
I agree.  The gap is wider than the wavelength, so yeah totally agree it's C.  It's not the proper mark scheme anyway.
Okay thanks  :D
but wait if the gap wasn't wider than the wavelength, it'd be D?  :S

Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1721 on: May 26, 2010, 09:55:28 am »
Okay thanks  :D
but wait if the gap wasn't wider than the wavelength, it'd be D?  :S

D, yes.
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Offline Dana

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1722 on: May 26, 2010, 09:56:38 am »
D, yes.
Learn a new thing everyday, thanks!
Do you think the exam's gonna be tough? Cuz chem yesterday was super easy

Offline Ghost Of Highbury

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1723 on: May 26, 2010, 09:58:05 am »
Learn a new thing everyday, thanks!
Do you think the exam's gonna be tough? Cuz chem yesterday was super easy

No Clue. CIE is evil.
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Offline Ivo

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Re: ALL PHYSICS DOUBTS - POST HERE !!
« Reply #1724 on: May 26, 2010, 09:58:22 am »
Learn a new thing everyday, thanks!
Do you think the exam's gonna be tough? Cuz chem yesterday was super easy

I'll say, Phy P1 will be harder than Chem P1, but then P3 would be easier than Bio! :D
Always willing to help!  8)
"In helping others, we shall help ourselves, for whatever good we give out completes the circle and comes back to us."