Physics MCQs thread.

[melon159]

is it B for q. 4 ??

 

[hassam]

 

[hassam]

YEA b melon...wat wud be anser for 20...m gtting B....

 

[aliya_zad]

Isnt the ans D?

 

[aliya_zad]

OOPs.....Sry i got it as B..
Read the ques wrong

 

[smartangel]

The kinetic energy of a vehicle of mass 1000 kg is 4.5 × 10^5J. It is stopped by applying a constant braking force of 6000 N.
What is its stopping distance?

A 37 m B 75 m C 150 m D 300 m

 

[hassam]

ITS b RYT ALIYA BT MS SAYS d

 

[hassam]

its b smart angel

 

[smartangel]

its b smart angel

can you please explain the working for it?

 

[yubakkk]

0.5mu^2=ke
so u=30
now f=-ma
a=-6
now use v^2=u^2+2as
v=0
so s=75
ans iz b?? is this answer??

 

[yubakkk]

http://www.xtremepapers.me/CIE/Internat ... _qp_11.pdf
q. no 5 and 22
plz hassan ,zishi or any one who know??? plz plz plz

 

[hassam]

how to figure out the ans

 

[smartangel]

yeah the answer is B. thanks
also, please tell me why the answer for 9 is C and not D?
http://www.xtremepapers.me/CIE/Internat ... _qp_12.pdf

 

[aliya_zad]

ITS b RYT ALIYA BT MS SAYS d

I guess D can be correct, coz Force applied is in the direction of (X apllyin a force on Y). In this case the only force applied by Y on X can be the reaction force (cz dis is bckward) which is the force applied by X on y. Ur MS is correct it seems....

Correct me if im wrong...

 

[yubakkk]

becoz d*v is mass not weight

 

[aliya_zad]

how to figure out the ans

I gt it as D..
Resultant force = mass x a
1.2x10^4-(1000x9.81) = 1000 x a
a= 2.2ms-2

 

[Zishi]

how to figure out the ans

D

 

[hassam]

aliya in a similar question of 2003....my anser agreed with ns using same logic which i used here

 

[hassam]

zishu=i its 1.1

 

[hassam]

oh wrong its 2.2...u r ryt??