Where did I go wrong??

Question

dls · Answer

attachment

dls · Answer

The question got cropped off :/
duh!
A sphere of mass m rolls without slipping on an inclined plane of inclination theta.Find the linear acceleration of the sphere and the force of friction acting on it.What should be the minimum co-efficient of static friction to support pure rolling...
I got 2 answers,:/ both seem legit,but obviously one of them is corrrect..which and why?:/

dls · Answer

@Mashy @shubhamsrg !!

dls · Answer

@RnR

dls · Answer

please batado yaar :/

anonymous · Answer

Hmm. I guess the acceleration would be 5/7gsin(theta)

shubhamsrg · Answer

torque center ke about kyu liya aur point of contact ke about kyu nahi ?

dls · Answer

meri marzi hai wo to? jis point ke about calculate kare uski velocity 0 honi chahiye..
aur @RnR u mean a 3rd answer? dafuq,why?,dono galat hai? :/

shubhamsrg · Answer

yesh, accn wahi hoga! B|

dls · Answer

??

dls · Answer

oye apna solution mat bata :/
maine kya galti kari wo bata >.<

anonymous · Answer

Teri friction to sahi hai 2/5ma.
Baaki dekhne de.

shubhamsrg · Answer

yesh, @RnR is right again! friction sahi hai 2/5ma! !!!

anonymous · Answer

:') mereko kuch aata hai.

shubhamsrg · Answer

"I got my mistake,5/7g sin theta aagaya par first wala case kyun galat hai?" 

~ DLS
:')

anonymous · Answer

Ye mgsin(theta)/6 kahan se aaya?
Jab a=5F/2m --> F=2/5ma ?

dls · Answer

"I got my mistake,5/7g sin theta aagaya par first wala case kyun galat hai?"

dls · Answer

f=mgsin theta/6 kyun nahi hai??

dls · Answer

see the first case..kaunsa step galat hai??

anonymous · Answer

Ye aaya kahan se mereko yahi nhi pta lag rha. :/

shubhamsrg · Answer

lol..

dls · Answer

kya kahan se aya?!?! kya exactly??

anonymous · Answer

a= gsin(theta) - F  
yahan se mgsin(theta)/6=a kahan se aaya?

anonymous · Answer

Acha ab mai samjha.. vo isliye nhi hai.. kyunki mgsin(theta) - F= ma hai.. 
gsin(theta) is not equal to a.

anonymous · Answer

To jo tune 2/5ma=2/5mgsin(theta) likha hai vo galat hai.

dls · Answer

Torque=fR
Moment of Inertia=2/5MR^2
fR=2/5MR^2 alpha
alpha nikaal lo..fir aage deklhlo?

anonymous · Answer

alpha nikaal ke kya krna hai? :/

dls · Answer

arre haan wo galat hai!!
but see the 1st case..left wala..right kyun dekh raha hai??

dls · Answer

merko pata hai answer ka logic sahi hai but left wale me kya galat hai !?

dls · Answer

alpha ko a/R nahi likha bus..aage to wahi cheez kari par..
a=R alpha?!

anonymous · Answer

gsin(theta) - F/m =5F/2m 
iske baad na?

anonymous · Answer

???

dls · Answer

do case banaye hai maine?
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