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

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  1.  
    2. sir here when we find the limiting friction, it should be variable know as the water coming out of the vessel and due to which its mass should be continuously decreasing
    1 years ago by Ashwani Pandey

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  2.  
    3. nice explanation
    2 years ago by

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  3.  
    4. Respected sir..... pressure is inversly proportional to area .and area is inversaly proportional to velocity as per principal of continuty...then pressure will be directly proportional to velocity....am i right?
    4 years ago by sharanya chothe

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  4.  
    5. how to enable Bengali subtitles???
    4 years ago by uddipan sinha

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  5.  
    6. sir why had you used height h above the point A .I think it should be from ground
    5 years ago by undefined

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  6.  
    7. sir u said in the lecture about coming discussion on efflux velocity when the hole is large. but there is no lecture on it. please tell me how can I get this
    5 years ago by Syed Sibatul

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  7.  
    8. sir kinetic energy per kg means k.e per unit weight or mass?
    5 years ago by richa

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  8.  
    9. Sir, why we have started off with height 'y' and not with H itself???
    5 years ago by bintu

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  9.  
    10. Sir what is P1?V and P2?V ?I can't understand .
    5 years ago by Ujjwal Kar

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  10.  
    11. sir why we not take here height diffrence in consinderation as we have given width of wing
    6 years ago by surat singh

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  11.  
    12. Q....Aflat plate is placed normal t0o a discharging jet of water.the jet discharges water at the rate of 0.2m3/s at a seed of 18 m/s.The force on the plate due to the jet,if the collision is inelastic is:???? QUICK PLEASE!!!!
    6 years ago by Murali M
    Ans 1 ->
    Density of water = 1000kg/m3 since it is given the pipe ejects 0.2 m3 (volume) of water per second so mass ejected per second is given by mass= 0.2 * 1000 kg/m3 = 200 kg/s. now we know that change in linear momentum equals to force. initial p1 = mv1 = 200*18= 3600 final mometum = 0 ( since it is an enelastic collision) change in momentum = 3600 kg s FORCE = 3600/1 sec = 3600 N thank you.
    6 years ago by shubham kushwaha

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  12.  
    13. Dear sir please answer Q Ideal fluid flows along a flat tube of constant cross section located in a horizontal plane and is bent the flow is steady. are pressure and velocities of fluid at point 1 and 2 equal?
    6 years ago by Ojasv Kamal

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  13.  
    14. Sir as we know pressure is inversely proportional to area and according to equation of continuity area is inversely proportional to velocity by this we can say that pressure is directly proportional to velocity but Bernoulli's equation says pressure is inversely proportional to velocity please clear my confusion or doubt
    6 years ago by Rishabh Kumar

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  14.  
    15. Sir when booster classes of fluids will start
    6 years ago by radhika jain

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  15.  
    16. on a body in fluid dynamics can more than 1 pressure can act and how we get to know which pressure is acting at what instant
    6 years ago by Dharamjeet Singh

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  16.  
    17. Sir I have a doubt how can we say that velocity of efflux is sqrt(2gy) because while writing the Bernoullis equation we have to consider the velocity with which the inner point in moving downwards and so it will have some kinetic energy
    7 years ago by Raghav G

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  17.  
    18. Sir we know that in a streamline flow less pressure corresponds to higher velocity.But here we found P(b)-P(a) which came a positive value however v(b) is greater than v(a)?
    7 years ago by Akshunn Trivedi
    Ans 1 ->
    that is applicable only for horizontal levels i guess... pressure velocity trade off cannot be the only aspect as here we have to also consider the potential energy per unit volume of the fluid
    6 years ago by ABHISHEK SHANKAR

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  18.  
    19. sir in liquid medium how the pressure difference decreases than in gaseous medium .
    7 years ago by deepak kumar

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  19.  
    20. sir in this question why can't we apply eqn of continuity at 2 holes (then velocity at the two pts. will become equal which is wrong acc. to the concept of efflux vel.)??
    7 years ago by
    Ans 1 ->
    Equation of continuity is applied to fluid flowing along same stream lines here the fluid coming out from the two holes is having different streamlines...
    7 years ago by Physics Galaxy
    Ans 2 ->
    thanks sir!
    7 years ago by

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  20.  
    21. Sir, I have a question that has been bothering me for many days. A L shaped tube is partially immersed inside a tank filled with a fluid and the tube is rotated with a angular velocity ? along its vertical hand. Due to this the water rises to a point D at a height h.At the end of the vertical section is a point C and the horizontal section is AC with A being the extreme point. On the horizontal arm AC there is a point B which is the midpoint of AC. The arm AC is of a length L. The horizontal arm is in air and atmospheric pressure is P(o). Which of the following relations is true if ? is the density of the fluid(water) and g is acceleration due to gravity. Option given in the question are: A. P(c) =P(o) - h?g ; P(B) =[ P(A) + P(B)]/2 B. P(c) is lesser than p(b) is lesser than p(o) and p(d) is nearly equal to p(c) C. Along the arm CA pressure increases logarithmically with distance from C, I.e. P(x) = P(c) + log|x/a| where a is a constant at given temperature and x is the distance from c. D. P(c) = P(o)exponential^[-ß?²L²] where ß is a constant at given temperature.
    7 years ago by Naveen Balaji

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  21.  
    22. A small ball of density a is immersed in a liquid of density b where b is greater than a to depth h and then released. The height above the surface of water to which it rises is
    8 years ago by Anonymous

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  22.  
    23. sir in example 5 why didnt u consider the pressure of the fluid (the one which we derived in bernoulli's theorem as P1and P2) ?? plz reply as soon as possible..
    8 years ago by Khushboo Jain
    Ans 1 ->
    In derivation we assumed a section of continuous body and thus it experiences pressure due to fluid body on the left as well as due to the body on the right.Whereas in this case we apply Bernoulli's equation on a complete body and only pressure it experiences is due to atmoshphere.
    8 years ago by
    Ans 2 ->
    Sir but still won't the point B experience the pressure (rho)gh+Patm
    8 years ago by nehal gupta
    Ans 3 ->
    In this case p1 is patm because there is only atmospheric pressure and p2 will also be patm and not patm +rho(gh) as it is the pressure outside which is patm and not patm +rho(gh) which is the pressure inside the liquid.
    8 years ago by Ayush Singh Rajput
    Ans 4 ->
    It is a case of free fall the pressure due to fluid was because of its weight which was balanced by the lower part of the fluid but in this case there is no force to balance the fluid so no pressure due to weight. Watch the video - in fluid statics about effective g here g.eff=0. even though the atmosphere is continuously applying a pressure on the container on fluid from all directions to compress it inwards no matter what.
    8 years ago by Mrinal kanti mahato
    Ans 5 ->
    To put in better words. (Rho.g.h) exists because the weight of the fluid acts in downward direction and the bottom of the container is opposing this weight. Therefore the bottom exerts an opposite force. But in this case since the bottom of the container is removed nothing opposes the weight of the liquid. therefor pressure at every point will be the same.
    7 years ago by Vin Diesel
    Ans 6 ->
    When bottom is removed pressure at bottom is also atmospheric pressure. ie. dP=0, So dPE=dKE.
    6 years ago by Rupesh Koirala
    Ans 7 ->
    at the top pressure will act as well as the bottom... net pressure will cancel out... so basically wrt to B A is at height H and wrt to A ,B is at height H so net pressure is zero
    6 years ago by ABHISHEK SHANKAR

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  23.  
    24. sir what is the meaning of fluid pressure P1 and P2 in the bernoulli's theorem..and how is it performing the work pdelV?? plz reply..
    8 years ago by Khushboo Jain
    Ans 1 ->
    it is a pressure volume work W = F.dx *A/A now dx.A is dv and F/A is P.
    7 years ago by Vishal Mishra

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  24.  
    25. a flat plate is placed normal to a discharging jet of water. the jet discharges water at the rate of 0.2( m-cube per second) and the speed of 18 metre per second. the force on the plate due to the jet if the collision is inelastic is......? a) 6 N b) 3N c) 360N d) 3600N
    8 years ago by Khushboo Jain

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  25.  
    26. sir why for x to be maximum dx/dh =0. can you explain the concept
    8 years ago by sagar choudhury

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  26.  
    27. Dear Sir How did you apply Bernulli's at point A and B.There is no term of Potential energy per unit volume.
    8 years ago by deepak choudhary
    Ans 1 ->
    Since A and B are at the same height so the potential energy difference will be 0
    8 years ago by nehal gupta

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  27.  
    28. in one book i found it was written that area of cross section increases as the liquid falls down ..
    8 years ago by ABHISHEK MALAKAR
    Ans 1 ->
    why don't u open up ur tap to see what happens
    8 years ago by Mrinal kanti mahato

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  28.  
    29. when a liquid is flowing,does the pressure decrease according to depth as rho g h?
    9 years ago by rachana s yajur

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  29.  
    30. Sir if we are given to find the recoil velocity of the vessel after the ejection of the fluid . How will we find it ?
    9 years ago by Mohak Sharma
    Ans 1 ->
    Due to fluid ejection a force is exerted on the vessel due to which it accelerates... you can write its acc = F/m and integrate to find the vessel velocity as a function of time...
    9 years ago by Physics Galaxy
    Ans 2 ->
    conservation of momentum leads to v=pav^2
    8 years ago by ABHISHEK MALAKAR

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  30.  
    31. A metal cube is placed in an empty vessel.When water is filled in the vessel so that the cube is completely immersed in the water,the force on the bottom at the point of contact: 1)decreases 2)increases 3)remains same 4)becomes 0
    10 years ago by kartik khanna
    Ans 1 ->
    increases
    9 years ago by Naveen Nallusamy
    Ans 2 ->
    If the bottom surface is rough.. force will increase and if its smooth...force will remain same...
    9 years ago by Physics Galaxy

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  31.  
    32. Dear Prof. In the example of a free falling fluid you use both at points x any y Patm in Bern eqn. Why is that considering that v is changing?, Thanks a lot. Uri Groisman
    10 years ago by Uri Groisman
    Ans 1 ->
    v is changing as cross sectional area of the falling fluid is changing... whole fluid body is in open atm thats why pressure is same at both points..
    9 years ago by Physics Galaxy

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  32.  
    33. err... sir if I may,I would like to point out that when you divide pressure difference by density it would be 8/800 and not 8/100 Thank You!!
    10 years ago by Akash Mohan Saxena (naam toh suna hi hoga)
    Ans 1 ->
    video updated.
    9 years ago by Yashit Garg

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  33.  
    34. can you p.s. tell me how the expression of flow rate of liquid ejection is written
    10 years ago by himanshu chhabra
    Ans 1 ->
    Pl follow all videos in sequence... flow rate of liq is product of flow vel and cross sectional area... I explained it earlier...
    9 years ago by Physics Galaxy

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