Recent questions tagged marks3

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State and prove the principle of law of conservation of linear

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A particle of mass 0.40 kg moving initially with constant speed of 10m/s to the north is subject to a constant force of 8.0 N directed towards south for 30s. Take at that instant, the force is applied to be t = 0, and the position of the particle at that time to be x = 0, predict its position at `t = -5s, 25s,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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How is centripetal force provided in case of the following?(i) Motion of planet around the sun,(ii) Motion of moon around the earth.(iii) Motion of an electron around the nucleus in an

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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State Newton’s second, law of motion. Express it mathematically and hence obtaina relation between force and

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A railway car of mass 20 tonnes moves with an initial speed of 54km/hr. On applying brakes, a constant negative acceleration of 0.3m/`s^2` is produced.(i) What is the breaking force acting on the car?(ii) In what time it will stop?(iii) What distance will be covered by the car before if finally

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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A train runs along an unbanked circular bend of radius 30m at a speed of 54km/hr. The mass of the train is 106kg. What provides the necessary centripetal force required for this purpose? The engine or the rails? What is the angle of banking required to prevent wearing out of the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Three identical blocks each having a mass m, are pushed by a force F on a frictionless table as shown in figure. What is the acceleration of the blocks? What is the net force on the block P? What force does P apply on Q. What force does Q apply on

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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What is meant by a positive work, negative work and zero work? Illustrate your answer with

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A body of mass 2kg initially at rest moves under the action of an applied force of 7N on a table with coefficient of kinetic friction = 0.1. Calculate the (1) Work done by the applied force in 10s (2) Work done by the friction in 10s (3) Work done by the net force on the body in

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Derive the expression for the potential energy stored in a

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Show that for a freely falling body the sum of its kinetic energy and potential energy remains constant at all points during its

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Ball A of mass m moving with velocity U collides head on with ball B of mass m at rest. If e be the coefficient of restitution then determine the ratio of final velocities of A and B after the

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If the momentum of the body increases by 20% what will be the increase in the K.E. of the

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Prove that in an elastic collision in one dimension the relative velocity of approach before impact is equal to the relative velocity of separation after

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A circular ring of diameter 40cm and mass 1kg is rotating about an axis normal to its plane and passing through the centre with a frequency of 10 rotations per second. Calculate the angular momentum about its axis of

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The moment of inertia of a solid sphere about a tangent is `7/5MR^2` . Find the moment of inertia about a

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Four particles of mass 1kg, 2kg, 3kg and 4kg are placed at the four vertices A, B, C and D of square of side 1m. Find the position of centre of mass of the

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Two uniform solid spheres of radii R and 2R are at rest with their surfaces just touching. Find the force of gravitational attraction between them if density of spheres be

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Find expressions for (1) potential energy (2) kinetic energy (3) total energy for an artificial

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A satellite is revolving is a circular path close to a planet of density P. find an expression for its period of

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