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

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  1.  
    2. SIR ISME AAP direct derivative kese find out kar lie mujhe batayein please
    2 years ago by

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  2.  
    3. Sir are these videos still relevent for JEE2022 aspirants to complete theory part of physics ??
    2 years ago by

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  3.  
    4. A Car is Stuck in mud. In Driver's Efforts to move the car, the driver splashes the mud from the rim of radius R spining at v1 speed where v1 square >gR. Find the max. height to which the mud will rise.
    2 years ago by Jatin Baggan

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  4.  
    5. it's showing “check internet "again and again..but my internet is fine...
    2 years ago by Nida 1414

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  5.  
    6. i am preparing for neet 2021 with pg concpt videos. does the videos cover each and every topic and formulas of ncert? i am asking this because neet 2021 is expected to be ncert based. or after these videos shoild i read each and every line of ncert?
    3 years ago by

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  6.  
    7. A particle move along a parabola such that its position vector at any time t is given as ?(?-r ) = ti ^ t2j ^. Find the magnitude of centripetal acceleration of the particle when it is at (2,9) is ac then calculate the value of N if N=(a_c v333)/2
    3 years ago by Venu Challa

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  7.  
    8. It is very good for neet students.
    3 years ago by

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  8.  
    9. why not normal acc =gcos(theta)??
    3 years ago by arnav raj

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  9.  
    10. Is Fcostheta / m always responsible for the change in magnitude of velocity?
    3 years ago by T.N.V.S.S.N.GANESH

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  10.  
    11. sir if u please can include to feature of fast forward such as 1.25× speed and 1.5× of speed of vedio then i will be great btw i lovef this app everything is so well
    4 years ago by Anurag Yadav

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  11.  
    12. Sir where I can get solutions for questions set examples
    5 years ago by Pratham kurkute

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  12.  
    13. sir any alternative method
    5 years ago by undefined

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  13.  
    14. sir please teach me about relative angular velocity
    5 years ago by E.Giran Amritha

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  14.  
    15. Respected sir, why did u take initial velocities as under root 2gl, under root 4gl
    5 years ago by vanshika deval
    Ans 1 ->
    and under root 5gl...maybe its a silly q. but I m confused.....pls help...
    5 years ago by vanshika deval

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  15.  
    16. how the last equation get solved I am unable to solve
    5 years ago by mayank pawar

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  16.  
    17. Dear sir, I want to know, in above example (solved example 10- circular motion) in an inertial frame of reference, which force provides it required outward (radial) acceleration as there is no friction and normal contact forced are perpendicular to the radial direction.
    5 years ago by Manish Yadav

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  17.  
    18. what is angle of repose?
    5 years ago by Jivintika Saini
    Ans 1 ->
    https://www.physicsgalaxy.com/lectures/1/1/9/141/Angle-of-Friction-
    5 years ago by vanshika deval

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  18.  
    19. Can you please provide the solutions to the given question sets?
    5 years ago by Mitesh Katariya

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  19.  
    20. Very very thank sir you are great sir
    5 years ago by Aditya Pathak

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  20.  
    21. sir why didn't you take a(normal)=(v^2)/l - gcos(theta) ?
    5 years ago by sandeep Neemkar

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  21.  
    22. sir, how do we get the formulae for radius of curvature in a parabolic trajectory
    5 years ago by abhishek alva

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  22.  
    23. sir great
    6 years ago by shib csk

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  23.  
    24. This is the first time i am able to solve the solved examples before seeing the solution sir.. Really overwhelmed,,, thnx But still I just can't get that confidence in mechanics even by trying to solve different types of illustrations i am not able to grasp the concepts like i did in Modern Physics and now I am really scared about the JEE Mains 2018
    6 years ago by Vinay Dayal

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  24.  
    25. Sir in the case of banking of road, why we are considering friction to act perpendicular to motion of tyres....why not along the suface
    6 years ago by Hardik Gupta

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  25.  
    26. SIR WHY AVG ACCN IS CALLED TANGENTIAL ACCN DIVIDED BY R
    6 years ago by yo honey singh

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  26.  
    27. Four particles each of mass M is moving along a circular path with same speed such that they always form a square of side (a), so find speed of each particle.
    6 years ago by Rahul

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  27.  
    28. Sir how we get the formula for center of curvature used in this illustration.
    6 years ago by Brahmjot Singh

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  28.  
    29. thank you
    6 years ago by Jamuna Baskar

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  29.  
    30. thank you
    6 years ago by Jamuna Baskar

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  30.  
    31. sir but what i dont understand from the ground frame of reference the force is acting inwards and centrifugal is only a psuedo force then why are you using it
    6 years ago by Vishnu Prasath

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  31.  
    32. respected sir, how come the formula of radius of curvature
    6 years ago by Smruti sikta Mishra

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  32.  
    33. This video is not running ... getting errors while loading .. more than 20 times .. i tried ??
    7 years ago by Rakesh Gupta

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  33.  
    34. how the differentiation of -v sin(wt)..is -v w coswt?
    7 years ago by Somnath Panda
    Ans 1 ->
    BHAI STUDY HARD
    7 years ago by TAMAJIT BANERJEE

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  34.  
    35. How differentiation of dy/dx is -gx/u^2?
    7 years ago by Somnath Panda

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  35.  
    36. what does radius of curvature mean here?
    7 years ago by Somnath Panda

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  36.  
    37. in v=rw...the unit of r is cm and the unit of w is rad/sec...so how by multipying r with w the unit of v is cm/sec...
    7 years ago by Somnath Panda

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  37.  
    38. SirCan you please tell how you did the integration of dw/root w
    7 years ago by Somnath Panda

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  38.  
    39. Can we say from the result that it is in SHM with respect to the x axis and y axis separately
    7 years ago by Raghav G

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  39.  
    40. Sir, could you please see this problem http://i.stack.imgur.com/PU4WY.png ? I am able to understand it in case of a rod. But suppose instead of a rod it was a string, how should we solve the problem? I tried by conserving momentum. mv=m(V_up)+m(V_down). Now since angular velocity should be equal for both I think V_down=2V_up. But after this I cannot proceed. Can you help sir??
    7 years ago by Sanchayan Dutta

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  40.  
    41. In formula v=rw here v is tangential velocity or linear velocity
    7 years ago by JANMAJAY SINGH
    Ans 1 ->
    linear velocity.
    7 years ago by Somnath Panda

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  41.  
    42. Sir why will the observer and object have same normal acceleration? If the tangential speed is same then the observer will have more accelerationas radius is less
    7 years ago by Sarthak Sharma
    Ans 1 ->
    observer is considered to be moving along with the body in same circle...
    7 years ago by Physics Galaxy

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  42.  
    43. Sir pls provide solutions to the QuSet as early as possible...
    7 years ago by Akshunn Trivedi
    Ans 1 ->
    queset solutions are not being uploaded as of now... it may take some time... for all quegrid questions solutions are there, you can also practice with these...
    7 years ago by Physics Galaxy

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  43.  
    44. sir here tangential acceleration should be R squqre by tsquare
    7 years ago by akash shinde
    Ans 1 ->
    It is specified that particle is moving at constant speed so tangential acceleration is always zero...
    7 years ago by Physics Galaxy

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  44.  
    45. A pendulum bob is attached to another bob find minimum velocity at bottom such that both complete circle.velocity is given to both Thanks in advance!
    7 years ago by Abhishek Jaswal

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  45.  
    46. Q what is maximum height gained by a pendulum bob of intial mass m : there is hole in bob at the top from where at rate r kg/s and velocity u mass is coming out. Also find maximum velocity of bob The Bob is released from bottom with velocity v.pls help... Thanks in advance!
    7 years ago by Abhishek Jaswal

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  46.  
    47. Respected sir ...velocity is displacement per unit time not change in displacement.simlarly angular velocity is rate of change of position vector ?? ....also angular is rate of change of angular velocity
    7 years ago by Divya r
    Ans 1 ->
    the formulae for velocity is displacement by time but its in depth analysis tells us that change in displacement.
    7 years ago by sujith kumar

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  47.  
    48. Please provide solutions for quests as soon as possible......
    7 years ago by Rakshith Raj
    Ans 1 ->
    quesets solutions are not being releases as of now... whenever available, we will inform our users via mail...
    7 years ago by Physics Galaxy

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  48.  
    49. sir why in rotating frame of rod for equilibrium of sleeve we use along tangential direction?
    7 years ago by ariya
    Ans 1 ->
    because in rotating frame the sleeve is not sliding along the rim...
    7 years ago by Physics Galaxy

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  49.  
    50. why not g is added for acceleration at bottom most point
    7 years ago by ariya
    Ans 1 ->
    We have already studied that in normal acceleration expression, all factors are already accounted...
    7 years ago by Physics Galaxy

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  50.  
    51. How is u=(5gr)^1/2
    7 years ago by shubham sharma
    Ans 1 ->
    Its already explained in the basic theory videos... watch the theory video of this again...
    7 years ago by Physics Galaxy

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  51.  
    52. Sir radius is constant but radius vector is not constant why
    8 years ago by HRISHIKESH DEORE

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  52.  
    53. the Kinematics equations are valid here too only their is change in variable. While the equations were for 1-D motion while circular motion is 2-D. Why it is so
    8 years ago by Tushar Goyal

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  53.  
    54. what will happen to the auto mobile if (mv^2)/r= uN..
    8 years ago by Vishal Ray
    Ans 1 ->
    the autombile will just able to turn
    7 years ago by hemanthsai

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  54.  
    55. there are no solutions for these QuSet tests??????...It would be very helpful for us if we get to see the solutions ...we can get to know our mistakes..
    8 years ago by Vishal Ray
    Ans 1 ->
    Yes right now quesets solutions are not live... when it will be available we will let you know...
    8 years ago by Physics Galaxy

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  55.  
    56. cant we use the equations of motion and solve the above question
    8 years ago by Ajay Shastry
    Ans 1 ->
    Speed Equation are used for uniform angular acceleration cases. Here as its not uniform we cannot use speed equations
    8 years ago by Physics Galaxy

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  56.  
    57. Sir at 1:50 why is p.e(final) of bob taken zero when it was considered at 1st case?
    8 years ago by Obnoxious
    Ans 1 ->
    here sir has taken the change in Potential energy
    8 years ago by Tathagat saxena

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  57.  
    58. WHY ARE WE ADDING THETA 1 AND THETA 2? AS THETA 2 IS THE FINAL ANGULAR DISPLACEMENT SO THE ANGULAR DISPLACEMENT AFTER 4s IS THETA 2
    8 years ago by Vishal Ray

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  58.  
    59. IS THERE NO DIFFERENCE BETWEEN ANGULAR SPEED AND ANGULAR VELOCITY?
    8 years ago by Vishal Ray

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  59.  
    60. please tell me how the whole angle to which the string will revolve on this cylindrical surface is Lo/R
    8 years ago by akanksh
    Ans 1 ->
    Consider the circumference and then u will get it
    7 years ago by Raghav G

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  60.  
    61. if the speed of the body and radius pathe are doubled what will be the centripital force?
    8 years ago by Gaurav Chauahn
    Ans 1 ->
    In this the centripetal force will be doubled.you can check the same by applying centripetal force F=mv^2/r.In this case we will take mass of the body m as constant.
    8 years ago by Anubhav Singh

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  61.  
    62. what is the work done by centripital force?
    8 years ago by Gaurav Chauahn
    Ans 1 ->
    This would mean that the force is always directed perpendicular to the direction that the object is being displaced. The angle Theta in the above equation is 90 degrees and the cosine of 90 degrees is 0. Thus the work done by the centripetal force in the case of uniform circular motion is 0 Joules.
    8 years ago by Gaurav Chauahn
    Ans 2 ->
    why did you specify uniform circular motion? the work done in non uniform circular motion is also 0 right?
    8 years ago by Amogh Varsha
    Ans 3 ->
    i mean work done by centripital force
    8 years ago by Amogh Varsha

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  62.  
    63. A mass moving with constant velocity parallel to x-axis then what change in its angular momentum with respect to origin.?
    8 years ago by mahendra choudhary

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  63.  
    64. sir equation 1 should be 1/2mu^2 + mgR(1-cos(theta))=1/2mv^2
    8 years ago by Rigvita Sharma
    Ans 1 ->
    try u are !!
    8 years ago by vishwanath v pai
    Ans 2 ->
    Yes u are right..
    8 years ago by Vishal Ray

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  64.  
    65. Why the tension in the string becomes zero when mg's component in direction of tension is more than it.
    9 years ago by Ashwini Abhishek
    Ans 1 ->
    this is kind of a late replybut since mg's component in direction of tension is more than it will dominate tension. Vertical circular motion will no longer be possible as the bob will fall down due to it's own weight
    7 years ago by Vin Diesel

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  65.  
    66. Why the tension in string becomes zero when mg's component direction tension greater
    9 years ago by Ashwini Abhishek

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  66.  
    67. Sir, My Self is LALA KARTHIK.Sir, in this lecture the equation (1) is wrong..sir.instead of, + u should keep (-) sign sir..
    9 years ago by lalabhai
    Ans 1 ->
    Equation (1) is correct as due to work done by gravity so work done by gravity is added to initial kinetic energy...
    9 years ago by Physics Galaxy
    Ans 2 ->
    #lala .. the eq 1 is crrect but it sdervtn is wrng !it should be 1/2mu^2 + mgR(1-cos(theta))=1/2mv^2. .. !
    8 years ago by vishwanath v pai
    Ans 3 ->
    Yes sir it should be 1/2mu^2 + mgR(1-cos(theta)) =1/2mv^2 ....... because the work done is done in direction of displacement.. Sir plz.. look after this and reply soon..
    8 years ago by Vishal Ray

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  67.  
    68. with due respect sir if a-tang=4m/sec2 cant v say dv/dt=a-tang --> dv/dt=4 or dv = 4dt ,,,integrating we can write v=4t,, at t=1,,,v=4 hence a-normal =v2/r -->16m/sec2 then tan (x)=4/16 or x= tan inverse 1/4 ?? sir plzz rply ASAP.. thanku?
    9 years ago by Mir Momin
    Ans 1 ->
    Dear Friend, a(tan)=4t not 4m/s2...this 4m/s2 is only at an instant t=1 sec so you cannot write dv = 4dt as it is not valid at all instants...
    9 years ago by Physics Galaxy

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  68.  
    69. if it is an accelerated motion, then wat abt its average velocity
    9 years ago by S. Karthigha @ Pachaiammal
    Ans 1 ->
    avg velocity is always [(v vec)final - (v vec) initial]/time taken which is valid here also... due to vector v changes continuously...
    9 years ago by Physics Galaxy
    Ans 2 ->
    avg velocity is always [(v vec)final - (v vec) initial]/time taken which is -valid here also... due to vector v changes continuously...
    8 years ago by Tanay Gawade

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  69.  
    70. in last step unit of change in velocity is CM/SEC and it is not the SI unit of velocity but average acceleration as answer to this problem is written in radian per second which is the SI unit of acceleration
    9 years ago by shivshant kumar
    Ans 1 ->
    No this is a silly question.Acceleration is written in cm/sec^2.Angular Acceleration is written in radian/sec^2 and both are different things which you must understand.
    7 years ago by Irshad Ahmed Khan

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  70.  
    71. how earth rotates on its axis ?
    9 years ago by neeraj khinchi
    Ans 1 ->
    no one really knows!
    9 years ago by Ch Vishal
    Ans 2 ->
    The Earth rotates from the west towards the east. As viewed from the North Star or polestar Polaris, the Earth turns counter-clockwise. The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where the Earth's axis of rotation meets its surface.No force is needed because there is no resistive force trying to slow the earth down, so in a sense it rotates now because it rotated before: angular momentum. To a good approximation, the planets and sun exert zero rotational (as opposed to linear gravitational) forces on each other. However, there are subtle couplings related to deformations of the planets, which is why for example the moon rotates so that one hemisphere is always visible from earth. By a similar mechanism the earth's rate of rotation could also change.
    9 years ago by Shreyansh jain

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  71.  
    72. can we see video related to circular motion thru this web site?
    9 years ago by Shiv Kr Gupta
    Ans 1 ->
    All videos of circular motion can be accessed under the section of Video Lectures through the tab Mechanics and the topic Circular Motion...
    9 years ago by Physics Galaxy

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  72.  
    73. how is y=xtan -gx2/2u2cos2teta
    9 years ago by G. Sangamithra
    Ans 1 ->
    it is equation of trajectory for projectile motion near the horizontal or flat ground
    9 years ago by Shreyansh jain
    Ans 2 ->
    Refer to video lectures on Kinematics projectile section
    7 years ago by Irshad Ahmed Khan

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  73.  
    74. When a particle is projected at some angle (not equal to 90) with horizontal, the radius of curvature of its path during the ascent decreases continously Is it true or false? Why
    10 years ago by Varun Saproo
    Ans 1 ->
    You can use the relation of radius of curvature and check whether it is monotonically increasing or decreasing by differentiating it....
    9 years ago by Physics Galaxy

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  74.  
    75. what if the body exactly fits inside the tube?
    10 years ago by prince jha
    Ans 1 ->
    Still the analysis remain the same... initially the normal reaction will act on the outer wall of tube and later when the contact is released normal reaction will start acting on the inner wall of tube...
    9 years ago by Physics Galaxy

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