Physics: Post your doubts here!

[The Sarcastic Retard]

No let me try once more,later.
If i dont get it I will ask.

That's the spirit. Good luck.

 

[Sarosh Jameel]

a)
When the stone will be at bottom most point, the Weight will act vertically downwards and reaction force (force excerted by glue on rod) towards the center of circle which is vertically upwards.
b)
T - W = mrw^2
15 = 0.3(0.85)w^2
w = 7.6rad/s

Thanks A lot !

 

[My Name]

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w08_qp_2.pdf
question 4 part b
What else can I write except for...speed depends on pd and as pd is unchanged speed will remain same.

http://papers.xtremepapers.com/CIE/...and AS Level/Physics (9702)/9702_w04_qp_2.pdf
question 6 part b

http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s07_qp_2.pdf
question 2 part d
Can anybody make this simple?
Please and thanks!

 

[Sarosh Jameel]

plz explain me part 1 !!!

 

[nehaoscar]

No...Actually the centripetal force acting toward the centre is approximately at 90 degrees of an angle to the velocity in which the object is moving.
Hence, it does not have a component that is in the direction of the velocity of the object.
So, obviously neither the object nor the mud moves toward the centre. But, yes...you can definitely state that the mud and the object both experience a force toward the centre. If this force weren't there the, the object and mud would both move off in a straight line.
There would be no circular motion.
The action of the centripetal force that ACTS TOWARD THE CENTRE basically just bends the otherwise straight-line motion of the mud and object.
I HOPE I MADE IT A LITTLE CLEAR.

Okay yes thankyou so much! Now i get it!

 

[Sarosh Jameel]

PLZ help with this part .. its june 2012 /42 .. q4

 

[The Sarcastic Retard]

b(i)(ii) Not getting any idea. Anyone can help me to detailed solution?
(i) How Accn of free fall = length times angular velocity squared? I have never learnt this.
(ii) No idea.

Thanks.

 

[The Sarcastic Retard]

T

go to
http://physics-ref.blogspot.com/2014/09/9702-november-2007-paper-4-worked.html

Thanks.

 

[maddy_em]

Can anyone please help me with Question 3 subsection (c)?

 

[aabiskar basyal]

can anyone plz post the link or upload the free physics and chemistry coursebook of as and a levels .....

 

[ashcull14]

 

[nehaoscar]

Both inverting and non-inverting amplifiers work on negative feedback where part of the output is fed back to the inverting terminal.
Does that mean in both type of amplifiers, the gain is reduced?

 

[zahra azam]

Guys help me with this qs

In 2002, the canary wharf tower in london was scaled by french urban climber,Alain robert.
The top of the tower is 235 m above street level, if he dropped an apple as he reached the top of the tower:
assuming that he could shout loudly enough, would it be any use if Robert had shouted to warn people below? (Speed of sound 340ms^-1)

 

[Mr.Physics]

zahra azam

 

[zahra azam]

zahra azam

Which eq is that for part b?

 

[Mr.Physics]

Which eq is that for part b?

Time=distance/speed
Time is t, distance is s, and speed is v.

 

[zahra azam]

Time=distance/speed
Time is t, distance is s, and speed is v.

What ???? wow
That is soo easy
I was going soo deep i forgot the basics xD
Thanks

 

[Mr.Physics]

What ???? wow
That is soo easy
I was going soo deep i forgot the basics xD
Thanks

Np

 

[Mr.Physics]

can anyone plz post the link or upload the free physics and chemistry coursebook of as and a levels .....

Hey check this out
http://www.gceguide.com/e-books/

 

[Mr.Physics]

https://googledrive.com/host/0B1ZiqBksUHNYc0tWVkExdEc4Nlk/January 2014 (IAL) QP - Unit 1 Edexcel Physics.pdf
Question 18 (a) (ii)
Help plz I can't figure it out
zahra azam My Name