All Mechanics DOUBTS HERE!!!

[7ooD]

dude ur prob iz wiz k rite when u put tan theta = k2j/ki k will cancel so u get it as 2j/i see

[astarmathsandphysics]

You dont divide j by i etc you divide 2 by 1
solve tan x=2

[raimunts]

HEY. Urgent. Can you help me please?! Are we supposed to write units in every step of working in M1? If not, when do we have to write the units? And Impulse = Final - Initial Momentum, ryt? But check the Jan 2010 M1 markscheme no.1, they show Initial - Final Momentum.

[7ooD]

look in 2010 markscheme r stupids or i dnt kno wat way of solving in the earth is this but i=mv-mu u get it minus cuz it is opposite direction but when u give final answer give it as 18 not -18 and when you are showing your working show it wiz units and very accurately

[astarmathsandphysics]

Dont bother with units at every stpe
only at the start and most important at the end

[Sweet_03]

can someone please help
M1 june 2009 - edexcel
Q6 (c)

[Saladin]

can someone please help
M1 june 2009 - edexcel
Q6 (c)

https://studentforums.biz/index.php/topic,5617.0.html

[astarmathsandphysics]

use f=ma for trailer
-200-T=200a
-100-200=200a so a=-1.5
for car -F-400+100=800a
F=-400+100-800*-1.5=-1500N

[Igcseboy]

hey in vectors question when we have to find bearing or the angle in which an object is travelling... so we always find using velocity ?:S:S:S

[Sweet_03]

oh Thanks .. but does thrust act in the opposite direction of tension ? 

i hav another Q
june2007 ..
Q6 (d)

so v for p was 4.2
therefore u for Q will be 4.2
a= 9.8
and isnt v=0
?

[astarmathsandphysics]

if they ask for velocity, find the direction too.
yes the thrust is in the opposite direction to tension - not always. It depends on the question
One mo

[astarmathsandphysics]

accelaeration is same for both particles

[Sweet_03]

sorry i mean part (e) not (d) :"$

[Igcseboy]

if they ask for velocity, find the direction too.
yes the thrust is in the opposite direction to tension - not always. It depends on the question
One mo

we will find direction using velocity components rite???

[astarmathsandphysics]

part e
speed when string goes slack is 4.2
find time to top of fight
v=u+at
0=4.2-9.8t so t=3/7
double this to get the answer