Q. A particle of mass is released from point on smooth fixed circular track as shown. If the particle is released from rest at then variation of normal reaction with angular displacement from initial position is -

NTA AbhyasNTA Abhyas 2022 Report Error

A

B

C

D

Solution:

When the block reaches a point where the angular displacement from the initial position is as shown.

The normal reaction force on the mass is
.
Here, is the centrifugal force on the mass.
By conservation of mechanical energy,

The Normal reaction,

.
Therefore, the normal reaction varies sinusoidally with as

Questions from NTA Abhyas 2022

1. Which one of the following statements is wrong in the context of -rays generated from an -ray tube?

2. Light of two different frequencies whose photons have energies and respectively illuminate a metallic surface whose work function successively. The ratio of maximum speeds of emitted electrons will be

3. A thin semicircular conducting ring of the radius is falling with its plane vertical in a horizontal magnetic induction . At the position MNQ, the speed of the ring is and the potential difference developed across the ring is

4. A flat mirror is arranged parallel to the wall at a distance from it. The light produced by a point source kept on the wall is reflected by the mirror and produces a light spot on the wall. The mirror moves with velocity towards the wall.

5. A particle moves along axis as , here is a constant. Which of the following is true?

Physics Most Viewed Questions

1. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

2. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

3. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. Calculate the acceleration of the block and trolly system shown in the figure The coefficient of kinetic friction between the trolly and the surface is , mass of the string is negligible and no other friction exists

NEET 2020 Laws of Motion

Latest Updates