Class 11 Physics | Fluid Statics | #13 Solved Example-4 on Fluid Statics | For JEE & NEET

[@AnshuKumar-bc2nk]

Sir at 1:50 why we are dividing mass of metal with their specific gravity? Should we not divide mass of metal by [(Specific gravity)×(density of water)] to get volume of each metal in alloy?? Please reply sir I am confused in the equation obtained.

[@SheryanKumar]

We are taking density in terms of g/cm3 so density of water here is 1

[@sahilraj3852]

I guess there is a flaw in this question, In the first sentence of the question instead of mass there must be "weight" OR instead of weight in the 3rd sentence there must be "mass". Tell me If I am wrong.

[@physicsgalaxyworld]

you only need to understand that in a question if mass is given then it is considered as bare mass of body in free space and whenever we measure mass of a body inside a fluid then it is always measured by accounting the buoyance force so always WEIGHT is measured and then it is divided by g (acc due to gravity) to calculate its effective weight... so it is termed as weight only but expressed in units of mass...

[@kariitk]

Same doubt

[@lonamisa6128]

@@kariitk watch revision checklist of fluid.. ull understand..he is talking about effective weight and measured effective weight.

[@tpsicmin]

Thanks Sir

[@Gunjan-ei9nt]

Sir force of buyoncy is v(ro)g and u have only used volume what about (ro) and 'g' ?

[@joshini_chandrika]

Density of water is 1 and g gets cancelled

[@kaikalaravikumar8251]

SIR AS BUOYANT FORCE IS vpg , you have not multiplied by g. why

[@physicsgalaxyworld]

+Kaikala RAVI KUMAR g gets cancelled in all terms of equation...

[@HarshgoelVEVO]

ohkk...actually i also had that doubt....thanks sir

[@praveen1654]

Thank you sir

[@kishanraj13]

Me too had same doubt Thanks sir!!!!

[@ayandeepmaiti3480]

Density of 1st obj=[S.G.][density of water]=[11.4].[1] in cgs .............and g is cancelled in both side. Apply v.ro.g=v.ro[as g is cancelled]=m/d.ro=[x/11.4] [1]...........have a great day

[@SUNGJINWOO-dk8nd]

thanks

[@saleenakuzhikkathottil3464]

sir ...96 is the mass of alloy not the actual weight ...don't u have to multiply with g to convert it to weight. ?

[@physicsgalaxyworld]

g cancels out in LHS and RHS of equation...

[@AlokShivhare-xk3vz]

Bhai hua tera iit?

[@azzymlbb5811]

sir what is specific Gravity?

[@physicsgalaxyworld]

+neji hyuga its the ratio of density of material to density of water...

[@vashistmanagari2045]

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[@azzymlbb5811]

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[@vashistmanagari2045]

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[@azzymlbb5811]

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[@yashaggarwal5131]

Sir why are we Multipying with specific gravity of water....as Mass of metal / Specific gravity(if it is density of sub./density of water) Should alone give us...Vp...

[@swayamrout9005]

Sir why the volumes are added? The alloy may be homogeneous.

[@physicsgalaxyworld]

This is because the mass of alloy is due to the two metals... and we do not consider cavities in it unless specified or some hint is there in question...

[@swayamrout9005]

@@physicsgalaxyworld thanks sir

[@codeguy21]

Sir why you don't multiply it with g????

[@physicsgalaxyworld]

g in all terms of equation will cancel out...

[@codeguy21]

@@physicsgalaxyworld ok sir , after seeing next video itself I understood , anyways thanks

[@bharatrahav2075]

Sir i am very confused why density of alloy is taken to be one

[@sudhanshushekhar6109]

it's relativel density of water

[@alexs6284]

Specific gravity of water is 1 ...

[@anveshrajguru6076]

I solved it three times sir plz recorrect it

[@satvik_srivastav]

Bro calculation is correct😄

[@anveshrajguru6076]

Sir calculations error mine x=83.6 gm for A

[@chakradhar5884]

👏🏻

[@swapnilaggarwal9470]

How can weight be in grams?