URGENT!!!! PHYSICS MCQ QUESTIONS

[superduper2009]

Astarmathsandphysics....
the answer you gave for 13 is wrong :S
can you please try the question again???
the correct answer is D
thanks alot in advance

[superduper2009]

muslimah thank you sooo much but i don't get the explanation about q 13...

[astarmathsandphysics]

I dont know why but I always thought the radius was 0.1 it is 0.05
Notice no tension in bottom
torque=F*r
3=T*0.05 so T=60

[astarmathsandphysics]

I dont know why but I always thought the radius was 0.1 it is 0.05
Notice no tension in bottom
torque=F*r
3=T*0.05 so T=60

[superduper2009]

Omg !!!!! I FEEL STUPID !!!! i was thinking the same :S.... argh..i wasted at least a good 30 mins on this q.
I was also getting my answer as 30 b4..
By the way if both of them had tension... we would be using the diameter ... right???

[astarmathsandphysics]

yes

[joel]

No torque is not equal to F x r....
Torque is equal  to force x perpendicular distance or Fx 2r

[astarmathsandphysics]

Force =tension is perpendiclar to radius in that q