Edexcel PHYSICS Doubts

[MKh]

n cud any1 suggest me hw i am supposed 2 prepare 4 d edexcel A2 unit 6B? Thanks...

[Deadly_king]

For A2 physics, do we need to know the details of milikan's oil drop experiment?

Yes, you need to have a brief overview about it. Rather you should know about the principle. The small details are not important.

n cud any1 suggest me hw i am supposed 2 prepare 4 d edexcel A2 unit 6B? Thanks...

Please mention which topic unit 6B is...

[MKh]

unit 6B iz d A2 Alternative to Practical paper (for international candidates)...iz any1 preparing 4 it???

[Arthur Bon Zavi]

unit 6B iz d A2 Alternative to Practical paper (for international candidates)...iz any1 preparing 4 it???

May be - ~ Amatu Allah ~ Aka GG.

[The Golden Girl =D]

May be - ~ Amatu Allah ~ Aka GG.

Nah I'm doing AS , which means 3B *in june tho * ,Sorry mate 

[Arthur Bon Zavi]

Nah I'm doing AS , which means 3B *in june tho * ,Sorry mate 

Sorry, I misjudged !

[Assi1993]

some momentum questions...
Q:A bungee jumper of mass 75 kg uses a bungee cord of length 25 m when jumping from a high bridge.Calculate the momentum of the jumper at the instant when the cord begins to stretch.
answer has 2 b=1660Ns
Q:An ice-hockey puch has a momentum of 1.2Ns just before making impact with the boards at the edge of the rink.It rebounds with a momentum of 1Ns after making contact for 0.15s.Calculate the average force acting on the puck during the collision.Ans=15N

[elemis]

For Question 1

Momentum = mass * velocity

To determine velocity when the rope is fully uncoiled we use :

v² = u² + 2as

Hence, v² = 0 + 2*9.8*25

V = 22.14

75*22.14 = 1660 Ns

[elemis]

Question 2

When the puck collides with the wall it will experience an IMPULSE.

Impulse = Force * time

We have time but need to find Impulse.

Hence, 1--1.2 = 2.2 Ns = impulse exerted in puck

Substituting into Impulse = Force * time

We get : 2.2 / 0.15 = force

Force = 14.666666 N i.e 15 N (2 s.f.)

[Assi1993]

thankkss Alot !! 

[Assi1993]

3 ques regarding circular motion
Q:A circular space station of radius 1000m is designed to rotate about an axis through its centre to stimulate gravity.How many revolutions per minute must it perform in order to produce an artificial gravity of 9.8m/s
Q:A ceiling fan is turned at a rate of 100 revolutions per minute. A spider is clinging to a blade of the fan.If the spider experiences a centripetal acceleration greater than 0.3g, it will lose its grip on the blade and be flung off.How far from the centre of the fan can the spider safely go?
Q:A car of mass 1600kg takes a bend of radius of curvature 30m on a horizontal road at a constant speed.If the maximum frictional force from the road is 65% of the car's weight,what is the greatest speed at which the car can take the bend without skidding?

[The Golden Girl =D]

Hey Everyone , I got a Question .

The third Question in the June 2008 Paper *unit 1* . I s it a part of the Syllabus ?

this Q's Basics are of Mechanics , so I got a bit Confused , You know 


By the way it's the first link in the following Page :
http://www.freeexampapers.com/past_papers.php?l=Past_Papers/A+Level/Physics/Edexcel/2008+Jun/

[elemis]

Hang on.

[elemis]

This is all in our syllabus and you must be able to do these kind of questions.

(a) To find the angle between the acceleration and the i vector imagine that 6 and 8 were x and y coordinates respectively.

Plot them if you want on a sketch graph. Then do tan^-1 8/6 = 53.1 degrees.

(b) F = ma <----- you must know this simple formula.

Since we are dealing with magnitudes simply find the modulus of the acceleration vector. 6^2 + 8^2 = 100  Hence, magnitude of acceleration is 10 m/s^2

10*0.4 = 4 N = magnitude of F.

(c) Let x be the unknown velocity vector.



Solving for x you should get : 39i + 30j

[The Golden Girl =D]

Ari : this is NOT the Question I was asking about . Cuz the Question does NOT have a C part  

it's this one :
http://www.freeexampapers.com/get_past_papers.php?l=Past_Papers/A+Level/Physics/Edexcel/2008+Jun/6731-01+Physics.pdf

third Q.