Recent questions tagged chapter6

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A ball of mass `m` moves with speed `v` and strikes a wall having infinite mass and it returns with same speed, then the work done by the ball on the wall is

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

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A body of mass `5 kg` is thrown vertically up with a kinetic energy of `490J.` The height at which the kinetic energy of the body becomes half of the original value is

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

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If two persons A and B take `2 s and 4 s`, respectively to lift an object to the same height h, then the ratio of their powers is

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At time `t = 0`, particle starts moving along the `x`-axis. If its kinetic energy increases uniformly with time `t`, the net force acting on it must be proportional to `t^n`, where the value of `n` is

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

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Which of the following statement is correct about non-conservative

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Which of the following statement is

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Which of the following statement does not specify an example of perfectly inelastic

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Match the Column I (angle) with Column II (work done) and select the correct option from the codes given below. Column I Column II A. `theta < 90°` p. Friction B. `theta= 90°` q- Satellite rotating around the earth C. `0 > 90°` r. Coolie is lifting a luggage

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

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A body is moved along a straight line by a machine delivering a power proportional to time `(P prop t)`. Then, match the Column I with Column II and select the correct option from the codes given below. Column I Column II A. Velocity is proportional to p. `t` B. Displacement is proportional to q. `t^2` C. Work done is proportional to r. `t^3`

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

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Assertion: Stopping distance =`('Kinetic energy')/('Stopping force')`. Reason: Work done in stopping a body is equal to change in kinetic energy of the

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

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Assertion: A spring of force constant `k` is cut into two pieces having lengths in the ratio 1 : 2. The force constant of series combination of the two parts is `2k'/'3`. Reason: The spring connected in series are represented by `k= k_1+

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

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Assertion: According to the law of conservation of mechanical energy, change in potential energy is equal and opposite to the change in kinetic energy. Reason: Mechanical energy is not

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

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Assertion: Decrease in mechanical energy is more in case of an object sliding up a relatively less inclined plane due to friction.Reason: The coefficient of friction between the block and the surface decreases with the increase in the angle of

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

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Assertion: For looping a vertical loop of radius `r`, the minimum velocity at lowest point should be `sqrt(5gr)`. Reason: In this event, the velocity at the highest point will be

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

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Assertion: Kilowatt-hour is the unit of energy. Reason: One kilowatt hour is equal to `3.6 xx 10^6

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Assertion: There is no loss in energy in elastic collision. Reason: Linear momentum is conserved in elastic

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Assertion: Quick collision between two bodies is more violent than a slow collision; even when the initial and final velocities are identical. Reason: The momentum is greater in first

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

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Assertion: Two particles are moving in the same direction do not lose all their energy in completely inelastic collision. Reason: Principle of conservation of momentum does not holds true for all kinds of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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Work A farmer ploughing the field, a construction worker carrying bricks, a student studying for a competitive examination, an artist painting a beautiful landscape, all are said to be working. In physics, however, the word ‘Work’ covers a definite and precise meaning. Work refers to the force and the displacement over which it acts. Consider a constant force `F` acting on an object of mass `m`. The object undergoes a displacement `d` in the positive `x`-direction as shown in figure.The work done by the force is defined to be the product of component of the force in the direction of

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

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