Physics: Post your doubts here!

[snowbrood]

well i got it

Force garvitational= force centripental

GMm/r^2 = mv^2/r


Use M= 1.9891 *10^30
r=1.5*10^11

and find v..wer z prob ??

well could u please help me also

 

[Lyfroker]

well i got it

Force garvitational= force centripental

GMm/r^2 = mv^2/r


Use M= 1.9891 *10^30
r=1.5*10^11

and find v..wer z prob ??

Why using gravitational force? :/

 

[Albert Einstein]

Why using gravitational force? :/

Because the gravitational force provides the centripental force..

 

[snowbrood]

yar please answer my question i am waiting

 

[Albert Einstein]

can u guys give the solution ans is DView attachment 15297

i reached to S=gt1 + 1/2*g*(t2-t1)2

Expand the bracket and u'll get the answer

 

[snowbrood]

Expand the bracket and u'll get the answer

thats the problem i cant expand the bracket there's where i fail can u please expand the brackets

 

[Lyfroker]

Because the gravitational force provides the centripental force..

N y do we need centripetal force? :S

 

[Albert Einstein]

thats the problem i cant expand the bracket there's where i fail can u please expand the brackets

Of course u will fail

becoz when u replace the initial velocity (gt1) in the eqns S=...
u must replace the time taken also that is gt1(t1-t2)
ur mistake is u replace the initial velocity,u by gt1 and forgot the time taken for the distance travelled.
Now u found ur mistake !!!!!!!!

 

[Albert Einstein]

N y do we need centripetal force? :S

Because centripental force is not a force by itself..but provided by another force for e,g tension friction..etc in zis example is gravitational force

 

[snowbrood]

Of course u will fail

becoz when u replace the initial velocity (gt1) in the eqns S=...
u must replace the time taken also that is gt1(t1-t2)
ur mistake is u replace the initial velocity,u by gt1 and forgot the time taken for the distance travelled.
Now u found ur mistake !!!!!!!!

please give me the correct solution i am damn confused tom is my test please

 

[Albert Einstein]

please give me the correct solution i am damn confused tom is my test please

 

[Albert Einstein]

 

[snowbrood]

thank u einstein love u friend thanks a ton

 

[snowbrood]

u deserve million likes

 

[Lyfroker]

Because centripental force is not a force by itself..but provided by another force for e,g tension friction..etc in zis example is gravitational force

Ok thnx

 

[Lyfroker]

An aircraft is used on a short horizontal flight on its journey from A to B the resultant velocity of the aircraft is 15m/s in a direction 60 degrees east of north and the wind velocity is 7.5m/s due north.
Show that for the aircraft to travel from A to B it should be pointed due east.

Albert Einstein cn u solve this one too plz

 

[Albert Einstein]

Albert Einstein cn u solve this one too plz

I've nt done relative velocity..its nt part of my syllabus sorry

 

[Lyfroker]

I've nt done relative velocity..its nt part of my syllabus sorry

It's ok

 

[yumichikabyakuya renji]

someone plz help with oct/nov 07 p1 Q37
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_1.pdf
the answer is C

and does anyone of you has the variable 2 for jun 09? i mean jun 09 p22... plz i really need it :O

 

[Albert Einstein]

someone plz help with oct/nov 07 p1 Q37
http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w07_qp_1.pdf
the answer is C

and does anyone of you has the variable 2 for jun 09? i mean jun 09 p22... plz i really need it :O

Hehe..this question i've tried it by elimination and it wrked out and such types of question often appear in paper 2 as well...
Refering to my notes i've found during nuclear reaction Mass and energy, nuleon number, charge, isospine, momentum, proton number is conserved so by eliminaton i've found neutron number as answer...