Physics: Post your doubts here!

[A*****]

 

[khadijaimran]

????

 

[Kanekii]

View attachment 64183

B since the magnitude of R1=R2
but both T1 and T2 are balancing R1 and R2
T1 is greater because it has shorter string loop and we know extension is directly proportional to length but it is inversely proportional to force.
so shorter length means greater force.

 

[Kanekii]

????

 

[Kanekii]

This plz
View attachment 64182

Is it D?

 

[Kanekii]

Can somebody please explain this

 

[A*****]

Can somebody please explain thisView attachment 64186

Consider gravity...when an object moves downwards in the direction of gravity so its gpe decreases so it will decrease here as well
Change in gpe= work done by force F= Fs

 

[khadijaimran]

ans is D. how??

 

[khadijaimran]

View attachment 64185

im sorry but i dont get it

 

[Kanekii]

im sorry but i dont get it

Or use the formula v2=u2+2as
v=2,u=0 and s=30m
2^2=2(30)a
a=0.066ms-2
F=ma
F=1.5 x 0.066
F= 0.010N

 

[khadijaimran]

Or use the formula v2=u2+2as
v=2,u=0 and s=30m
2^2=2(30)a
a=0.066ms-2
F=ma
F=1.5 x 0.066
F= 0.010N

i get it now thanks, oh and the mass will be 0.15kg

 

[Kanekii]

Help

 

[Kanekii]

i get it now thanks, oh and the mass will be 0.15kg

oops my bad

 

[Tom Sewage]

29 b?
Q5
diameter reading is= 3.5+0.31
=3.81
A=pi(D)^2/4
A=pi(3.81)^2/4
A=11.4mm2

Thanks
29 answer is B

 

[Tom Sewage]

This plz
View attachment 64182

is the answer D

 

[khadijaimran]

24. i know the obsv. freq will inc what about the other part?
21. how will i know this?

 

[Hisham Khan]

24. i know the obsv. freq will inc what about the other part?
21. how will i know this?
View attachment 64190 View attachment 64191

 

[Hisham Khan]

24. i know the obsv. freq will inc what about the other part?
21. how will i know this?
View attachment 64190 View attachment 64191

The dopplers effect also depend on speed of object.Observed frequency will decrease according to formula if speed of object decrease

 

[Hisham Khan]

Even tho I am retaking physics,It may help you anyway.
Kanekii can you tell me some useful physics books for revision and something really useful

 

[A*****]

is the answer D

Its B