Physics

[nidzzz09]

Help!

http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf

Question 13

http://www.xtremepapers.me/CIE/Internat ... 9_qp_1.pdf

Question 9 n 12

Pls show the working


THANKS

 

[Zishi]

Help!

http://www.xtremepapers.me/CIE/Internat ... 5_qp_1.pdf

Question 13

Total Clockwise moments = 20 x 3 = 60 Nn
Total Anticlockwise moments = (5x2) + (10x2)= 30

So resultant moments = 60 - 30 = 30 Nm, so A is the answer

http://www.xtremepapers.me/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_s09_qp_1.pdf

Question 9 n 12

Pls show the working


THANKS

Q9: Change in momentum = mass in kg times change in velocity

Initial velocity = 20
Final velocity = -30

Change in v = 20--30 = 50

So change in momentum = (100/1000) times 50 = 5

So B is the answer.

Q12: As it is horizontal, so it implies that IT is in equilibrium, because its weight must be equal to the air resistance, then. In equilibrium sum of all moments and forces is equal to zero. So D is the answer...

I hope my answers are right...

 

[Talha]

zishi plz explain dat y in q13 u hv taken 10N force being in da anticlocwise direction? isnt it horizontal??

 

[libra94]

zishi plz explain dat y in q13 u hv taken 10N force being in da anticlocwise direction? isnt it horizontal??

its taken anticlockwise cuz it'll move anticlockwise!! i mean, its logical!!
use ur arm for an example, and pull ur hands horizontally, ur arm will go in an anticlockwise direction keeping the pivot fixed!!