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A body is moving on a curved path with a constant speed. What is the nature of its

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A stone tied at the end of string is whirled in a circle. If the string breaks, the stone flies away tangentially.

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What are the two angles of projection of a projectile projected with velocity 30m/s, so that the horizontal range is 45m. Take, `g =

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The blades of an aeroplane propeller are rotating at the rate of 600 revolutions per minute. Calculate its angular

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What is a uniform circular motion? Explain the terms time period, frequency and angular velocity. Establish relation between

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A body of mass m is thrown with velocity `'υ'` at angle of `30^o` to the horizontal and another body B of the same mass is thrown with velocity υ at an angle of `60^o` to the horizontal. Find the ratio of the horizontal range and maximum height of A and

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At what point of projectile motion (i) potential energy maximum (ii) Kinetic energymaximum (iii) total mechanical energy is

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If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the

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The two ends of spring – balance are pulled each by a force of 10kg.wt. What will be the reading of the

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A lift is accelerated upward. Will the apparent weight of a person inside the lift increase, decrease or remain the same relative to its real weight? If the lift is going with uniform speed,

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A soda water bottle is falling freely. Will the bubbles of the gas rise in the water of the

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Two billiard balls each of mass 0.05kg moving in opposite directions with speed 6m/s collide and rebound with the same speed. What is the impulse imparted to each ball due to

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A nucleus is at rest in the laboratory frame of reference. Show that if it disintegrates into two smaller nuclei, the products must be emitted in opposite

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Explain why passengers are thrown forward form their seats when a speeding bus stops

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A man weighs 70kg. He stands on a weighting machine in a lift, which is moving (a) Upwards with a uniform speed of 10m/s. (b) Downwards with a uniform acceleration of 5m/`s^2`. (c) Upwards with a uniform acceleration of 5m/`s^2`. Take g = 9.8m/`s^2`. What would be the readings on the scales in each case what would be the reading if the lift mechanism failed and it came down freely under

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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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Ten one rupee coins are put on top of one another on a table. Each coin has a mass m kg. Give the magnitude and direction of (a) The force on the `7^(th)` coin (counted from the bottom) due to all coins above it. (b) The force on the `7^(th)` coin by the eighth coin and (c) The reaction of the sixth coin on the seventh

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A thief jumps from the roof of a house with a box of weight W on his head. What will be the weight of the box as experienced by the thief during

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Which of the following is scalar quantity? Inertia, force and linear

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Action and reaction forces do not balance each other.

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