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High School/JEE/NEET/IPhO Physics | 17-19 Yrs

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  1.  
    2. well! done sir
    4 years ago by Amit Kumar

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  2.  
    3. Why has sir taken velocity as constant from the beginning of the motion? Wouldn't the particles at first accelerate due to their weight before reaching a terminal velocity??
    5 years ago by Vatsal Goyal

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  3.  
    4. Sir is this law applicable to only for sphere???how can we find formulas for other rigid bodies ??
    7 years ago by Advait Kulkarni

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  4.  
    5. WHAT ABOUT GRAVITATIONAL FORCE?THIS SHOULD BE BUOYANT FORCE=FORCE OF GRAVITY+FORCE VISCOUS
    7 years ago by vipul gupta

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  5.  
    6. A tube of length l and radius R carries a steady flow of fluid whose density is p(rho) and viscosity n(eta). The fluid flow velocity depends on the distance r from the axis of the tube as v = v0 (1 - r^2/R^2). Find (a) the friction force exerted on the tube by the fluid (b)the pressure difference at he ends of the tube???
    8 years ago by Shivam Bansal
    Ans 1 ->
    (a) part can be solved by finding (eta)A dv/dr at r=R and (b) part can be obtained by using Poisueille's Equation for an elemental cylindrical layer of radius r and with dr... then integrate it for finding the total flow rate to be taken in the equation... that will give your pressure difference which will be same for all elemental layers...
    8 years ago by Physics Galaxy
    Ans 2 ->
    Sir I want to know that whether your books provide material only for mains and olympiads or advanced.if not or yes after solving physics galaxy it is better to follow cengage or sri balaji or IE irodov
    5 years ago by editor jst
    Ans 3 ->
    sorry for everyting my mistake
    5 years ago by editor jst

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  6.  
    7. why the variation in velocity is assumed to be linear. with linear variation shear stress will be same for all layers.?
    8 years ago by AKASH GOYAL

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  7.  
    8. sir here it it fluid dynamics then how did you directly apply p1= patm +hdg and we cant even apply bernouli's theorem cuz it is applied only for non viscous fluid.. then how do we solve it
    8 years ago by Vaishnavi Kulkarni

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  8.  
    9. Sir u worte viscosity as--==10^-2...,, and took 10^-3 in answer.....
    10 years ago by himanshu rajesh muley
    Ans 1 ->
    because 'poise' is a C.G.S. unit . Since 1 poise = 0.1 poisueille (S.I. Unit) .. 10^-2 poise = 10^-3 poisueille . He just converted it because all other values were given in S.I. units
    9 years ago by Libin Kaleeckal

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