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question_answer1) Statement I: work is a scalar quantity Statement II: work done may be positive (or) negative (or) zero
question_answer2) How much work is done by a force of ION in moving a body through a distance of 2m in its own direction?
question_answer3) Work is said to be done if Statement I: a force is applied which brings about motion Statement II: a force is applied but no motion is produced
question_answer4) The potential energy of a body at a height h is mgh. When it falls to the ground, its K.E becomes
question_answer5) The potential energy of a freely falling object decreases continuously. What happens to the loss of potential energy?
question_answer6) Statement I: If a body is lifted vertically upwards, then the force required to lift the body is equal to it weight Statement II: Work done in lifting a body = weight of body x vertical distance
question_answer7) When B falls through\[{{\frac{1}{4}}^{th}}\]of distance from support to ground, his KE could have been (\[\text{g}=\text{9}.\text{8m}/{{\text{s}}^{\text{2}}}\])
question_answer8) An object of 100 kg is lifted to a height of 10 m vertically. What will be the work done? [\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\]]
question_answer9) A person of mass 50 kg climbs a tower of height 72 metre. The work done is [\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\]]
question_answer10) A man of mass 100 kg eats a plum cake of energy content 1470J. If he utilizes all this energy then the height to which he could lift (jump) himself is
question_answer11) A body of mass 2kg moving up has potential energy 400J and kinetic energy 580J at a point 'P' in its path. The maximum height reached by the body is (\[\text{g}=\text{1}0\text{m}{{\text{s}}^{-\text{2}}}\])
question_answer12) A stone projected vertically upwards from the ground reaches a maximum height h. When it is at a height 3h/4, the ratio of its kinetic and potential energies is
question_answer13) A body of mass 1 kg is projected vertically up with certain velocity. At certain point its P.E and K.E are 8J and 90J. Then maximum height reached by it is(\[\text{g}=\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\])
question_answer14) Statement I : Power is defined as the amount of work done in one unit of time Statement II: When a body does more amount of work in a particular time, its power is said to be greater
question_answer15) The power of a water pump is 2 KW. If\[\text{g}=\text{1}0\text{m}/{{\text{s}}^{\text{2}}}\]the amount of water it can raise in one minute to a height of 10m is
question_answer16) A lorry and a car moving with the same kinetic energy are brought to rest by application of brakes which
question_answer17) A 1000 kg car can accelerate from rest to a speed of 25 m/s in 10 s. What average power must the engine of the car produce in order to cause this acceleration. Neglect the friction loss.
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