## Ruchi. 3 years ago question?

1. Ruchi.

|dw:1339902704337:dw| FIND ACCELERATION?

D: I don't know D: @tomas.A answer it! :D

It's a her...don't be rude.

4. Tomas.A

Rebecca don't he so shy answer her

5. Tomas.A

that's what i said ^

liezz

7. Ruchi.

are'nt you members geetting mah problem on right..? do help me pleas.!!

lol um I don't know how to do this. I thought Tomas would be smart enough but I guess not ;D

9. Tomas.A

i forgot all the physics when i finished it

11. A.Avinash_Goutham

it's easy........acc = net pulling force/eff mass

12. Ruchi.

i know that . if you can then explain it.

13. A.Avinash_Goutham

see the net pullin force = 5g-2g

14. saifoo.khan

|dw:1339903618208:dw|

15. A.Avinash_Goutham

not it's 7a i guess

16. Ruchi.

i get its answer 7/3 is its right

17. A.Avinash_Goutham

let's do it the long way.......... 5g-T=5a

18. A.Avinash_Goutham

T-t=(Wb)a t-2g=2a

19. Ruchi.

how is it?

20. A.Avinash_Goutham

simultaneous equations

21. saifoo.khan

a = 3/10

22. A.Avinash_Goutham

wait wat is the wait of B? nd i dont think it's 3/10

23. Ruchi.

its not given.

24. A.Avinash_Goutham

it's 3g/7........i guess

25. A.Avinash_Goutham

if T=t

26. UnkleRhaukus

Atwood machine

27. Ruchi.

we hav to use only 1st and 3rd equation?

28. yakeyglee

Use Newton's second law. $\sum \vec F_i = m \vec a$$m_A g - m_Cg = (m_A+m_B+m_C)a$

29. ujjwal

Agreed with @yakeyglee, And if there is friction between B and the surface on which it is kept, don't forget to subtract frictional force from the net force in your calculation.