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ROTATIONAL DYNAMICS PYQS MHTCET 2022 | MHTCET 2022 | Prof Ram Sharma | #mhtcet2022 |
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In this video Pyqs of 2021 and 2020 are Solved for chapter Rotational Dynamics .
0:00 Introduction
0:24 A mass ‘m’ is tied to one end of a spring and whirled in a horizontal circle with constant angular velocity. The elongation in the spring is 1 cm. If the angular speed is doubled, the elongation in the spring is 6 cm. The original length of the spring is ………….
(13th October 2020 Shift I)
4:57 A disc of mass 10 kg and radius 0.1 m is rotating at 120 r.p.m. A retarding torque brings it to rest in 10 s. If the same torque is due to force applied tangentially on the rim of the disc then magnitude of force is …………. (13th October 2020 Shift II)
9:57 A rotating body has angular momentum ‘L’. If its frequency of rotation is halved and rotational kinetic energy is doubled, its angular momentum becomes …………. (13th October 2020 Shift II)
12:20 A solid sphere of mass ‘M’ and radius ‘R’ is rotating about its diameter. A disc of same mass and radius is also rotating about an axis passing through its centre and perpendicular to the plane but angular speed is twice that of the sphere. The ratio of kinetic energy of disc to that of sphere is ………….
(13th October 2020 Shift II)
15:40 A bucket containing water is revolved in a vertical circle of radius ‘r’. To prevent the water from falling down, the minimum frequency of revolution required is …………. (13th October 2020 Shift II)
17:16 A string of length ‘𝓁’ fixed at one end carries a mass ‘m’ at the other end. The string makes 3/𝜋 revolutions / second around the vertical axis through the fixed end as shown in figure. The tension ‘T’ in the string is …………. (13th October 2020 Shift II)
19:55 From a uniform circular thin disc of mass 9M and radius R, a small disc of radius R/3 is removed. The centre of the small disc is at a distance 2R/3 from the centre of original disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through the centre of the disc of radius R is …………. (13th October 2020 Shift I)
25:26 Let M and L be the mass and length of thin uniform rod respectively. In 1st case, axis of rotation is passing through centre and perpendicular to its length. In 2. case, axis of rotation is passing through one end and perpendicular to its length. The ratio of radius of gyration in first case to second case is …………..
(14th October 2020 Shift I)
27:29 The angular speed of the minute hand of a clock in degrees per second is …………
29:02 Two rings of radius ‘R’ and ‘nR’ made of same material have the ratio of moment of inertia about an axis passing through its centre and perpendicular to the plane as 1:8. The value of ‘n’ is (mass per unit length is constant)
(14th October 2020 Shift I)
#mhtcet2022
0:00 Introduction
0:24 A mass ‘m’ is tied to one end of a spring and whirled in a horizontal circle with constant angular velocity. The elongation in the spring is 1 cm. If the angular speed is doubled, the elongation in the spring is 6 cm. The original length of the spring is ………….
(13th October 2020 Shift I)
4:57 A disc of mass 10 kg and radius 0.1 m is rotating at 120 r.p.m. A retarding torque brings it to rest in 10 s. If the same torque is due to force applied tangentially on the rim of the disc then magnitude of force is …………. (13th October 2020 Shift II)
9:57 A rotating body has angular momentum ‘L’. If its frequency of rotation is halved and rotational kinetic energy is doubled, its angular momentum becomes …………. (13th October 2020 Shift II)
12:20 A solid sphere of mass ‘M’ and radius ‘R’ is rotating about its diameter. A disc of same mass and radius is also rotating about an axis passing through its centre and perpendicular to the plane but angular speed is twice that of the sphere. The ratio of kinetic energy of disc to that of sphere is ………….
(13th October 2020 Shift II)
15:40 A bucket containing water is revolved in a vertical circle of radius ‘r’. To prevent the water from falling down, the minimum frequency of revolution required is …………. (13th October 2020 Shift II)
17:16 A string of length ‘𝓁’ fixed at one end carries a mass ‘m’ at the other end. The string makes 3/𝜋 revolutions / second around the vertical axis through the fixed end as shown in figure. The tension ‘T’ in the string is …………. (13th October 2020 Shift II)
19:55 From a uniform circular thin disc of mass 9M and radius R, a small disc of radius R/3 is removed. The centre of the small disc is at a distance 2R/3 from the centre of original disc. The moment of inertia of the remaining disc about an axis perpendicular to the plane of the disc and passing through the centre of the disc of radius R is …………. (13th October 2020 Shift I)
25:26 Let M and L be the mass and length of thin uniform rod respectively. In 1st case, axis of rotation is passing through centre and perpendicular to its length. In 2. case, axis of rotation is passing through one end and perpendicular to its length. The ratio of radius of gyration in first case to second case is …………..
(14th October 2020 Shift I)
27:29 The angular speed of the minute hand of a clock in degrees per second is …………
29:02 Two rings of radius ‘R’ and ‘nR’ made of same material have the ratio of moment of inertia about an axis passing through its centre and perpendicular to the plane as 1:8. The value of ‘n’ is (mass per unit length is constant)
(14th October 2020 Shift I)
#mhtcet2022