Author Topic: Physics Help HERE ONLY !!  (Read 80940 times)

Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #525 on: June 03, 2009, 04:25:49 pm »
may someone answer this question
paper 3 oct/nov 2008 q (2) all please and :D thank you


thats easy


look first
a)
u no that moment=force * distance
so 4 instance i chose 200g and 100g
to make sure they both have da same moment
200*4=100*8
800=800
so that its at equilibrium

b)
It will stay stable which ensures that its at equilibrium.

c)
do the same thing i used to explain part a)
M1=200*10*4(*10 because its force and 200g is mass so *10 to make it weight)
m2=100*10*8

M1=M2
8000Nm=8000Nm
and the answer 4 da 2 blaks is 8000 or wateva accordind to ur chosen values

d) (200*10)+(100*10)+(200*10)

=5000N
i multiplies each one by 10 to make them forces



hope it helped :)
hello eamyzz
just need to confirm one thing
are u sure that the answer for d) is 5000N
if so plz explain me how..
if u read my answer i have written 5N
because 200 + 200 + 100 = 500g = 500/100 N = 5N
thanks
 :)
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Offline sweetie

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Re: Physics Help HERE ONLY !!
« Reply #526 on: June 03, 2009, 04:26:07 pm »
i think da easiest way is  2 draw a parallelogram ;)

Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #527 on: June 03, 2009, 04:27:50 pm »
2a) put different value of masses on bothe sides of the pivot  but make sure tht after using the formula (fxd) (where
f=force and d=distance) the product must be same. (then only they are balanced i.e in equilibrium)

 the distance are given for each hole to the pivot. so i recomend to take the first hole(with distance 4cm) and add mass 200g at one side of the pivot. and on the other side,  add mass 100g on the second hole (with disatnce 8 cm from teh pivot)

but first convert the masses to forces by multiplying the mass into 10, so 200( convert this to killogram by deviding it by 1000 ) 0.2 x 10 u get 2
so when using the formula "fxd " u get on one side: 2x4=8Nm
                                                     and                                      
                                                   on the other side: 1x8=8Nm
                         - see both have the same product so it is now they are balanced(in equilibrium)


ans2b) the disc does not move or rotate as u put the mass so they are balanced so no turning effect which means no moment.

c)use formula "fxd" but convert the mass in to force but multiplying them in to 10 and convert the mass to kg first
               2x4=8Nm
               1x8=8Nm

d)this is the force of pivot which is downwar to get tht simply add the masses u put
1+8=9N

but rmember u can choose any mass at any distance but the product with equation "fxd" must be same

thts all,hope this helped, any confusion or difficulties or help u need, im all here

how o u get the d) answer as "1+8" 
the masses chosen is 200g and 100g = 2N and 1N --> 3N + 2N(of the disc) = 5N
am i correct
i am not sure
plzz help
thank u :)
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Offline Eamyzz

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Re: Physics Help HERE ONLY !!
« Reply #528 on: June 03, 2009, 04:29:37 pm »
may someone answer this question
paper 3 oct/nov 2008 q (2) all please and :D thank you


thats easy


look first
a)
u no that moment=force * distance
so 4 instance i chose 200g and 100g
to make sure they both have da same moment
200*4=100*8
800=800
so that its at equilibrium

b)
It will stay stable which ensures that its at equilibrium.

c)
do the same thing i used to explain part a)
M1=200*10*4(*10 because its force and 200g is mass so *10 to make it weight)
m2=100*10*8

M1=M2
8000Nm=8000Nm
and the answer 4 da 2 blaks is 8000 or wateva accordind to ur chosen values

d) (200*10)+(100*10)+(200*10)

=5000N
i multiplies each one by 10 to make them forces



hope it helped :)
hello eamyzz
just need to confirm one thing
are u sure that the answer for d) is 5000N
if so plz explain me how..
if u read my answer i have written 5N
because 200 + 200 + 100 = 500g = 500/100 N = 5N
thanks
 :)



ya sure...look u didnt multiply the masses by 10 to make them forces
look this would b da answer if u did
=(200*10)+(200*10)+(100*10)
=2000+2000+1000
=5000N
thats all :)
if its still not clear dont hesitate to say it ;)
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #529 on: June 03, 2009, 04:30:03 pm »
nope i was worng ,ur correct, it is my silly mistake to add 8, but i corrected it in the previous page... ;D
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #530 on: June 03, 2009, 04:31:37 pm »
umm eamyz u have to first devide them by 1000 cuz they are in grams

u must devide the mass by 1000 to convert them to killos THEN multiply them by 10, so u get

200/1000= 0.2kg
then 0.2kg x 10 = 2N
one who masters both the pen and paper is indeed a true warrior.

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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #531 on: June 03, 2009, 04:32:12 pm »
common...i just answered a question and asked a doubt

whose giving me -rep for that
 :(

@eamyzz...
100g = 1N
200g = 2N

i don't think u multiply it by 10..
plzz clear my doubt
thanks once again
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #532 on: June 03, 2009, 04:33:55 pm »
lol, whats ure doubt.. :)
one who masters both the pen and paper is indeed a true warrior.

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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #533 on: June 03, 2009, 04:34:51 pm »
the newton thingy

am i correct

100g = 1N
therefore 200g = 2 N
?????
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Offline Eamyzz

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Re: Physics Help HERE ONLY !!
« Reply #534 on: June 03, 2009, 04:36:04 pm »
umm eamyz u have to first devide them by 1000 cuz they are in grams

u must devide the mass by 1000 to convert them to killos THEN multiply them by 10, so u get

200/1000= 0.2kg
then 0.2kg x 10 = 2N




ooops another silly mistake Thanks so it will b
=(0.2 kg*10)=2N

=2N+2N+1N
5N


soo u r right Adi n i am wrong sorry  :-[
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #535 on: June 03, 2009, 04:37:09 pm »
oh common whoz -rep me...
one who masters both the pen and paper is indeed a true warrior.

\m/metal head\m/

Offline Eamyzz

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Re: Physics Help HERE ONLY !!
« Reply #536 on: June 03, 2009, 04:38:21 pm »
its ok i will make it 30 again ;)
Live=Hope
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So,No life=No hope=DEATH
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Offline Shogun

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Re: Physics Help HERE ONLY !!
« Reply #537 on: June 03, 2009, 04:38:36 pm »
lol some ones -repin me and adi . tht suckz

and really adi u got any doubts?
one who masters both the pen and paper is indeed a true warrior.

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Offline Ghost Of Highbury

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Re: Physics Help HERE ONLY !!
« Reply #538 on: June 03, 2009, 04:41:20 pm »
hey shogun
thanks
anyway
i had just 1 doubt,,,
clarified now

thanks scholar
lol..

plzz stop -repping me
wat did i doooo??? :)
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Offline persian17

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Re: Physics Help HERE ONLY !!
« Reply #539 on: June 03, 2009, 04:41:30 pm »
Guys what is the difference b/w Flemings Left and right hand rule? when do you use each?