Let be the force acting on a particle having position vector and be the torque of this force about the origin. Then

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 63 views

A particle performing uniform circular motion has angular momentum L. If its angular frequency is doubled and its kinetic energy halved, then what would be the new angular momentum?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 75 views

A circular disc X of radius R is made from an iron plate of thickness t, and another disc Y of radius 4R is made from an iron plate of thickness t/4. Then what is the relation between the moment of inertia Ix and Iy?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 70 views

A particle of mass m moves along line PC with the velocity v as shown in the below image. What should be the angular momentum of the particle about P?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 78 views

A solid sphere, a hollow sphere and a ring are released from top of an inclined plane (frictionless) so that they slide down the plane. Then what is the maximum acceleration down the plane is for (no rolling)?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 80 views

Initial angular velocity of a circular disc of mass M is . Then two small spheres of mass m are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 59 views

Initial angular velocity of a circular disc of mass M is . Then two small spheres of mass m are attached gently to two diametrically opposite points on the edge of the disc. What is the final angular velocity of the disc?

Anonymous User Physics Circular and Rotational Motion 25 Mar, 2020 59 views

Explain The Structure of Virus.

Jitendra Kumar Biology 25 Mar, 2020 73 views

The upper half of an inclined plane with inclination perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half is given by

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 64 views

A smooth block is released at rest on a 45° incline and then slides a distance d. The time taken to slide is n times as much to slide on a rough incline than on a smooth incline. What is the coefficient of friction?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 73 views

An annular ring with inner and outer radii R1 and R2 are rolling without slipping with a uniform angular speed. The ratio of the forces experienced by the two particles situated on the inner and outer parts of the ring, F1 /F2 is

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 65 views

A block rests on a rough inclined plane making an angle of 30° with the horizontal. The coefficient of static friction between the block and the plane is 0.8. If the frictional force on the block is 10 N, then what is the mass of the block (in kg)? [take g = 10 m/s2]

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 57 views

Two masses m1 = 5 kg and m2 = 4.8 kg tied to a string are hanging over a light frictionless pulley. What is the acceleration of the masses when lift free to move?  [g = 9.8 m/s2] Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 67 views

A machine gun fires a bullet of mass 40 g with a velocity 1200 m/s-1. The man holding it can exert a maximum force of 144 N on the gun. How many bullets can he fire per second at the most?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 70 views

A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 76 views

A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m. If a force P is applied at the free end of the rope, then what is the force exerted by the rope on the block?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 81 views

A horizontal force of 10 N is required to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. What is the weight of the block? Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 55 views

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves down with an acceleration of 5 m/s2, what will be the reading of the spring balance?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 81 views

Three forces start acting simultaneously on a particle moving with velocity . These forces are represented in magnitude and direction by the three sides of a triangle ABC (as shown). The particle will now move with velocity Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 75 views

Three identical blocks of masses m 2 kg are drawn by a force F = 10.2 N with an acceleration of 0.6 ms –2 on a frictionless surface, then what is the tension (in N) in the string between the blocks B and C? Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 139 views

A light string passing over a smooth light pulley connects two blocks of masses m1 and m2 (vertically). If the acceleration of the system is g/8, then what is the ratio of the masses? Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 57 views

One end of a massless rope passes over a massless and frictionless pulley P, which is tied to a hook C while the other end is free. Maximum tension that the rope can bear is 960 N. With what value of maximum safe acceleration can a man of 60 kg climb on the rope? Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 55 views

When forces are acting on a particle of mass m such that and are mutually perpendicular, then the particle remains stationary. If the force is now removed then the acceleration of the particle is

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 54 views

If a lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. What is the acceleration of the ball by the man in the lift and a man standing stationary on the ground?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 56 views

What is the minimum velocity with which a car driver can traverse a flat curve of radius 150 m and coefficient of friction 0.6 to avoid skidding?

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 67 views

A ball of mass 0.2 kg is thrown vertically upwards by applying a force by hand. If the hand moves 0.2 m which applying the force and the ball goes upto 2 m height further, find the magnitude of the force. Consider g = 10 m/s2

Anonymous User Physics Laws of Motion and Friction 25 Mar, 2020 67 views

In a multi­electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?

(i)  n=1,l=0,m=0

(ii)  n=2,l=0,m=0

(iii)  n=2,l=1,m=1

(iv)  n=3,l=2,m=1

(v)  n=3,l=2,m=0

Anonymous User Chemistry Structure of Atom 24 Mar, 2020 60 views

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inter­orbit jumps of the electron for Bohr orbits in an atom of hydrogen?

Anonymous User Chemistry Structure of Atom 24 Mar, 2020 62 views