All Mechanics DOUBTS HERE!!!

[egymoha]

what about June 2006 8b ?

[crazed2009]

Don't worry mate! Put them in the direction you want, up or down ya wadee3

Caues at last, if you put it in the wrong direction, your answer would be in negative, and you would know

actually A.F tht doesnt always work.. i was also coming to ask the same question - which way do we put the reactional force??... c this Q:

a window of mass 15kg and height 120cm is hinged along its top edge. It is kept open by the thrust frm a light strut of lenght 50cm attached to the wall and perpindicular to the lower edge of the window. By modelling the window as a uniform lamina, calculate the thrust in the strut and the magnitude an direction of the force exerted on the window by the hinge? (u hv to draw the diagram)

i attached the answer... i got T but i dnt really understand the rest.. :S...
y is the reactional force acting upwards meaning tht at the hinge the horizontal force is to the left and the vertical force is upwards? if u put them any other way the correct answer doesnt cm... :S:SS:
\HELP PLEEEEEEEEEEEEZ

[Meticulous]

I apologize everybody for the delay! I'm on it now

[Meticulous]

what about June 2006 8b ?

First of all:

V_B = u(e+1)/5

And e between B and the wall = 4/5

Therefore, the velocity of B after rebounding= 4/5 * u(e+1)/ 5 = 4u(e+1)/25

There is a further collision between A and B, and so V_Brebound > V^A

PLUS, V_A > 0 -----> u(4e-1)/5 >0 and so e>1/4

here is a further collision between A and B, and so V_Brebound > V^A :
 
e<9/16

combine the two inequalities to give you

1/4 < e < 9/16

Was I clear ?

[Meticulous]

actually A.F tht doesnt always work.. i was also coming to ask the same question - which way do we put the reactional force??... c this Q:

a window of mass 15kg and height 120cm is hinged along its top edge. It is kept open by the thrust frm a light strut of lenght 50cm attached to the wall and perpindicular to the lower edge of the window. By modelling the window as a uniform lamina, calculate the thrust in the strut and the magnitude an direction of the force exerted on the window by the hinge? (u hv to draw the diagram)

i attached the answer... i got T but i dnt really understand the rest.. :S...
y is the reactional force acting upwards meaning tht at the hinge the horizontal force is to the left and the vertical force is upwards? if u put them any other way the correct answer doesnt cm... :S:SS:
\HELP PLEEEEEEEEEEEEZ

Pls post the original q to see if i have the answer to it, and save time

[crazed2009]

its a txtbk question ... 

[raimunts]

Hello. Can someone PLEASE help me solve these two kinematics questions? They are from the Edexcel AS Modular Mathematics M2 book:
Edexcel AS Modular Mathematics M2
Ex.1A No. 16, page: 11
Ex.1B No. 12, page: 19

Any help will be really appreciated. Thanx a lot in advance!

[raimunts]

Someone please help me fast! It's urgent! Pleaaase!! 

[cooldude]

Hello. Can someone PLEASE help me solve these two kinematics questions? They are from the Edexcel AS Modular Mathematics M2 book:
Edexcel AS Modular Mathematics M2
Ex.1A No. 16, page: 11
Ex.1B No. 12, page: 19

Any help will be really appreciated. Thanx a lot in advance!

if u posted the question there is a higher probability you would get the answer as the textbook you are referring to, is not in the possession of every person who has the capability of answering your doubt

[7ooD]

for my doubt about where to put the directions if hinged at a wall u can put in the moment equation wiz its minus sign and in the direction u assumed but if u dnt put minus sign make sure u put it in the direction u found from da equation

[3oo3a]

hello!
I couldn't find the answer of question 8 (c) january 2010 paper on the internet, i tried finding it alone, and i got (5i)(c^2 +1)

anyone got the same?

[7ooD]

i will give it now 1 min

[7ooD]

here is the markscheme

http://www.scribd.com/doc/28007685/Edexcel-GCE-January-2010-Mechanics-2-M2-Marking-Scheme and

here is how to solve whole question 8

http://i109.photobucket.com/albums/n63/7ood/bf1dcc50.jpg
http://i109.photobucket.com/albums/n63/7ood/ca603707.jpg
http://i109.photobucket.com/albums/n63/7ood/a5e4a210.jpg
http://i109.photobucket.com/albums/n63/7ood/ec107c11.jpg 

[shushuIG]

ould anyone plz help me in jan 2010 in Q4 and 6 plz?? i need it ASAP exam in 2 hours!!:S

[astarmathsandphysics]

Let me get up.