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JEE Main Solutions –Work, Energy, Power, Collisions – 2018 (Online and Offline Papers)

JEE Main 2013-2017 Solutions are available on the COACHENGG APP

Q26 (JEE Main 2018 Offline): In a collinear collision, a particle with an initial speed v0 strikes a stationary particle of the same mass. If the final kinetic energy 50% greater than the original kinetic energy, the magnitude of the relative velocity between the two particles, after collision, is :

Q27 (JEE Main 2018 Offline): It is found that if a neutron suffers an elastic collinear collision with deuterium at rest, fractional loss of its energy is pd, while for its similar collision with carbon nucleus at rest, fractional loss of energy is pc. The values of pd and pc are respectively :
(1) (0, 0) (2) (0, 1) (3) (.89, .28) (4) (.28, .89)

Q28 (JEE Main 2018 Offline): The mass of a hydrogen molecule is 3.32 × 10–27 kg. If 1023 hydrogen molecules strike, per second, a fixed wall of area 2 cm2 at an angle of 45° to the normal, and rebound elastically with a speed of 103 m/s, then the pressure on the wall is nearly :
(1) 2.35 × 102 N/m2 (2) 4.70 × 102 N/m2
(3) 2.35 × 103 N/m2 (4) 4.70 × 103 N/m2

Q29 (JEE Main 2018 Online 2): A proton of mass m collides elastically with a particle of unknown mass at rest. After the collision, the proton and the unknown particle are seen moving at an angle of 90° with respect to each other. The mass of the unknown particle is:
(1) 𝑚/2 (2) 𝑚 (3) 𝑚/√3 (4) 2𝑚

Q30 (JEE Main 2018 Online 3): A body of mass m starts moving from rest along x-axis so that its velocity varies as 𝑣=𝑎√𝑠 where 𝑎 is a constant and 𝑠 is the distance covered by the body. The total work done by all the forces acting on the body in the first t seconds after the start of the motion is:
(1) 1/8 𝑚𝑎^4 𝑡^2 (2) 8𝑚𝑎^4 𝑡^2 (3) 4𝑚𝑎^4 𝑡^2 (4) 1/4 𝑚𝑎^4 𝑡^2

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24 Comments

Comments are closed.

  1. COACHengg 3 years ago

    For JEE Main 2013-2017 Solutions of the chapter Work, Energy and Power, Download our android app "COACHENGG" from google playstore or from the link given below: https://play.google.com/store/apps/details?id=com.rdnc.coachengg
    All our content is organized there subject wise and Chapterwise along with assignments, and doubt discussion forum and you can access it for a small monthly subscription fee.

  2. A video 3 years ago

    Jee main 12 class chapter

  3. Gulfam Raza 3 years ago

    @Rohit Dahiya Sir, plz its a due request to upload full concept and NCERT numericals video on IONIC Equilibrium…Hoping for a positive response..!!

  4. monish khan 3 years ago

    Bhai neet ke bhi

  5. dk raju 3 years ago

    Sir please function questions jee main it is very important topic

  6. Parshuram Yadav 3 years ago

    I am not able to register?

  7. Sai Krishna 3 years ago

    tats the iq i feel only people with iq can get into iits

  8. Sushma Singh 3 years ago

    Useful

  9. Aakash Rao 3 years ago

    Nice video

  10. Bipin Singh 3 years ago

    Sir please upload the ques of modern physics and co-ordinate geometry……because as u also know both of them togeather consist approximately 10 to 12 question every year. I really appreciates ur way of teaching and trust me u r really very conviencing.

  11. ABHISHEK SINGH 3 years ago

    Sir…..where is part-1 of this video…have you removed it?

  12. Vinod Gulia 3 years ago

    Very nice video

  13. Atul Dagar 3 years ago

    Thank you sir for another video sir pls upload videos on ionic equilibrium as soon as possible waiting for it

  14. Surajit Chakrabarty 3 years ago

    Sir this way(only '18) 1st cover all chapters of physics

  15. Enjoy Study 3 years ago

    Superb vedio sir 😘😘👍👍👌👌

  16. Rishu Raj 3 years ago

    Sir Magnetism plz

  17. Rishu Raj 3 years ago

    Thankyou Sir for this video

  18. Sanjay Siwach 3 years ago

    Super , you are best teacher ..

  19. Pranav Gakhar 3 years ago

    Sir I'm 11 class student and I am facing lot of problems in chemistry chapter IONIC equilibrium………..Plz make vedio on formulas and basic concepts of IONIC equilibrium…….

  20. Aalok Arun 3 years ago

    Questions are so easy

  21. nikhil pandey 3 years ago

    Very easy question

  22. RDS sandesh patel 3 years ago

    Please sir biology ka question dhi bhejo

  23. pranay kumar 3 years ago

    Sir please solve hc Verma vol 1 and 2
    1. Please make video solution of worked out example of each chapter
    2. Please solve objective 1 and objective 2 of hc Verma book
    3.please solve short type answer of hc Verma book
    4. Please solve exercise question of hc Verma book
    5. Also provide theory of each chapter in form of video.
    6. Solve previous year iit jee problem ( 1979- to……)
    Fix the price of each chapter approx Rs 100
    Approximately 20 lakh students will give NEET and various engineering exam .In 20 lakh students approx 10-11 lakh students know Hindi very well.
    In my opinion approx 50000 surely purchase ur course per year. For example if we provide hc Verma video solution in Rs 3000 ( both volume) then your turn over will be 15 crore.

  24. nihal gupta 3 years ago

    Sir… keep uploading such video…. REALLY REALLLY USEFUL…

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