ROTATIONAL DYNAMICS PYQS MHTCET 2022 | MHTCET 2021 & 2020 QUESTIONS SOLVED | MHTCET 2022|

In this video Pyqs of 2021 and 2020 are Solved for chapter Rotational Dynamics .

0:00 introduction
0:21 A 1 kg mass is tied to a light inextensible string of length l = 10/3 m is whirled in a circular path of radius 1m in a vertical plane . The ratio of maximum to minimum tension in string is 4 . The speed of the stone at the highest point of the circle is
a) 5 m/s b) 10m/s c) 15m/s d) 20 m/s [ MHTCET 2021

2:59 A particle of mass 5 kg moves in a circle of radius 20 cm . Its linear speed at a time t is given by v = 4 t , t is in second and v is in m/s . Find the net force acting on the particle at t = 0.5 s.
a) 20 N b) 20 √( 2 3) N c) 20 √(2 6) N d) 10 N [MHTCET 2021]

5:20 A 1kg stone attached to the end of a 60 cm chain is revolving at the rate of 3 rev/s . If after 30 s , it is making only 1 rev/s . Find the mean torque acting on it .
a) 0.15 Nm b) 0.32 Nm c) 0.25 Nm d) 0.20 Nm [ MHTCET 2021 ]

7:08 Three identical uniform thin rods each of length l and mass m are joined together to form a letter H . The moment of inertia of the system about one of the sides of H is

9:41 A body of mass ' m ' is tied to one end of a spring and whirled round in a horizontal plane with a constant angular velocity. The elongation in the spring is 1cm . If the an…

12:14 A particle is moving with constant speed v in circle. What is the magnitude of average acceleration after half rotation

13:55 A thin rod of length 2l is rotating about an axis passsing through its centre and perpendicular to its length . The radius of gyration of rod is
a) 𝑙/√3 b) 𝑙/√4 c) 𝑙/√14 d) 𝑙/√12 [Mhtcet 2021 ]

14 :50 A heavy mass is attached at one end of a thin wire and whirled in a vertical circle. The chances of breaking the wire are maximum when …………. (12th Oct. 2020 Shift 1)
a) the wire is horizontal. b) the wire makes an angle of 60° with the horizontal
c) the mass is at the lowest point of the circle. d) the mass is at the highest point of the circl

16:02 A ball of mass ‘m’ is attached to the free end of an inextensible string of length ‘l’ . Let ‘T’ be the tension in the string. The ball is moving in horizontal circular path about the vertical axis. The angular velocity of the ball at any particular instant will be …………. (12th Oct. 2020 Shift 1)

17:33 Two cars of masses ‘ml’, and ‘m2‘ are moving in the circles of radii ‘r1’ and ‘r2’ respectively. Their angular speeds ‘ω_1’ and ‘ω_2’ are such that they both complete one revolution in the same time ‘t’. The ratio of linear speed of ‘m1’ to the linear speed of ‘m2’ is …………. (12th Oct. 2020 Shift 1)

18:51 A wheel is at rest in horizontal position. Its M.I. about vertical axis passing through its centre is ‘I’. A constant torque ‘facts on it for ‘t’ second. The change in rotational kinetic energy is ………….
(12th Oct. 2020 Shift 1)

21:40 A thin circular ring of mass ‘M’ and radius ‘r’ is rotating about its axis with an angular speed ‘ω’. Two particles each of mass ‘m’ arc now attached at diametrically opposite points. The angular speed of the ring will become ………….. (12th Oct. 2020 Shift II)
a) ωM/(M+2m) b) (ω(M-2m))/M c) ωM/(M+m) d) (ω(M-2m))/(M+2m)

23:50 Moment of inertia of a solid sphere about its diameter is ‘I’. It is then casted into 27 small spheres of same diameter. The moment of inertia of each new sphere is ................. (12th Oct. 2020 Shift II)
a) I/62 b) I/122 c) I/243 d) I/31

27:11 A simple pendulum of length is suspended from a roof of a trolley. A trolley moves in horizontal direction with an acceleration ‘a’. What would he the period of oscillation of a simple pendulum?
[g is acceleration due to gravity] (12th Oct. 2020 Shift II)

30:27 A wheel of radius 2cm is at rest on the horizontal surface. A point P on the circumference of the wheel is in contact with the horizontal surface. When the wheel rolls without slipping on the surface, the displacement of point P after half rotation of wheel is ………….. (12th Oct. 2020 Shift II)

33:41 Mass of 0-5 kg is attached to a string moving in horizontal circle with angular velocity 10 cycle/min. Keeping the radius constant, tension in the string is made 4 times by increasing angular velocity 'ω'. The value ‘ω’ of that mass will be …………. (12th Oct. 2020 Shift II)
a) 1/2 cycle/s b) 1/4 cycle/s c) 1/3 cycle/s d) 1/5 cycle/s

36:05 A particle is performing uniform circular motion. If 'θ^',〖(_^')ω〗^','∝'and ‘a’ are its angular displacement, angular velocity, angular acceleration and centripetal acceleration respectively, then which of the following is ‘WRONG’? (12th Oct. 2020 Shift II)
(‘v’ is its linear velocity)

37:40 A ring and a disc have same mass and same radius. The ratio of moment of inertia of a ring about a tangent in its plane to that of the disc about its diameter is ………….(13th October 2020 Shift I)
a) 8 : 1 b) 6 : 1 c) 2 : 1 d) 4 : 1

#Mhtcet2022

[aimers]

Sir pls continue . You are the best teacher. Itne hard topics ko bhi aap easy KR dete ho

[gouravathare]

Thank you sir 🥰 and please 🙏🏻🙏🏻 upload videos for us on each day. I depend on you😶😶

[pavansawant]

Hello Sir..Big fan of your teaching.. ❤️🔥🙏

[ratanjadhav]

2Ml^2 / 3 Hoga Kya.. Question Of H shaped Rods Me??

[mathsandphysicshscboard]

Sir MHt cet mcq pyq se hi aata h kya sir

[ishadeshmuk]

Tumhi ya video madhe Tumch introduction nahi dil