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Assertion: The force of attraction between a hollow spherical shell of uniform density and a point mass situated inside it, is zero. Reason: The value of G does not depend on the nature and size of the

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Assertion: The escape velocity for a planet is `v_e=sqrt(2gR)`. If the radius of the planet is four times, the escape velocity becomes half `(i.e. v_e'=(v_e)/2)`.Reason: In the relation for escape velocity, `v_e =sqrt(2gR)`, the acceleration due to gravity `g` is inversely proportional to radius of the planet. Thus, `v_e prop

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Assertion: The geo-stationary satellite goes around the earth in west-east direction. Reason Geo-stationary satellites orbits around the earth in the equatorial plane with `T=24 h` same as that of the rotation of the earth around its

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Acceleration due to gravityThe acceleration for any object moving under the sole influence of gravity is known as acceleration due to gravity. So, for an object of mass `m,` the acceleration experienced by it is usually denoted by the symbol g which is related to F by Newton’s second law by relation `F= mg`. Thus,`g=F/m=(GM_e)/(r_e^2)`Acceleration `g` is readily measurable as `R_e` is a known quantity. The measurement of `G` by Cavendish’s experiment (or otherwise), combined with knowledge of `g and R_e` enables one to estimate `M_e` from the above equation. This is the reason why there is a popular statement

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Earth’s SatelliteEarth satellites are objects which revolve around the earth. Their motion is very similar to the motion of planets around the Sun. In particular, their orbits around the earth are circular or elliptic. Moon is the only natural satellite of the earth with a near circular orbit with a time period of approximately 27.3 days which is also roughly equal to the rotational period of the moon about its own axis. Also, the speed that a satellite needs to be travelling to break free of a planet or moon’s gravity well and leave it without further propulsion is known

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

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Is the motion of a simple pendulum strictly simple

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Give some practical examples of S. H.

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Using the correspondence of S. H. M. and uniform circular motion, find displacement, velocity, amplitude, time period and frequency of a particle executing

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If the displacement of two waves at a point is given by:-`Y_1=a sin wt``Y_2=a sin (wt+pi/2)`Calculate the resultant

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An organ pipe P1 closed at one end vibrating in its first overtone and another pipe P2 open at both the ends vibrating in its third overtone are in resonance with a given tuning fork. Find the ratio of length of P1 and

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What is the direction of centripetal force when particle is following a circular

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(a) State impulse – momentum theorem?(b) A ball of mass 0.1kg is thrown against a wall. It strikes the wall normally with a velocity of 30m/s and rebounds with a velocity of 20m/s. calculate the impulse of the force exerted by the ball on the

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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

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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

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A body of mass 3kg makes an elastic collision with another body at rest and continues to move in the original direction with a speed equal to one – third of its original speed. Fine the mass of the second

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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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(a) Why is moment of inertia called rotational inertia? (b) Calculate M.I of a uniform circular disc of mass 500gm and radius 10cm about (i) Diameter (ii) axis tangent to the disc and parallel to diameter (c) Axis passing trough centre and perpendicular to its

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Show that an artificial satellite circling round the earth in an orbit of radius obeys keeper’s third

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Find an expression for the weight of a body at the centre of the

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