Q261
Open questionA force of 20 N displaces an object through 2 m and does a work of 20 J. The angle between the force and displacement is:
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Physics GK · all questionsWork, Energy and Power
Work, Energy and Power
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Q262
Open questionThe momentum of a moving object depends on some factors. Which of the following statements is most appropriate?
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Q263
Open questionMohan, having a mass of 40 kg, runs up a staircase of 50 steps in 10s. If the height of each step is 15 cm, then what is his power?
(Take g = 10m/s2)
(Take g = 10m/s2)
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Q264
Open questionThe work done by the force is positive when-
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Q265
Open questionIf the momentum of an object is tripled, its kinetic energy-
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Q266
Open questionAll forces have:
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Q267
Open questionWhat will be the average power required to lift an object of 80 kg to a height of 40 m in 50s? (g=10m/s2)
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Q268
Open questionConsider the following statements.
A 4-wheel vehicle moving in a sharp circular path at high speed will
1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards
Which of these statements are correct?
A 4-wheel vehicle moving in a sharp circular path at high speed will
1. Overturn about its outer wheels
2. Overturn about its inner wheels
3. Skid outwards
4. Skid inwards
Which of these statements are correct?
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Q269
Open questionWhat is the SI unit of energy?
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Q270
Open questionWhich of the following devices converts chemical energy into electrical energy?
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Q271
Open questionA raised hammer possesses
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Q272
Open questionWhat is the potential energy of an object of mass 40 kg when it is lifted at a height of 5m above the ground?
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Q273
Open questionMechanical energy - kinetic energy = ?
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Q274
Open questionWhat is called pushing or pulling an object to move it?
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Q275
Open questionAn object capable of performing a work has . . . . . . . .
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Q276
Open questionThe energy received by an object by its position and configuration is called?
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Q277
Open questionThe energy of a body is
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Q278
Open questionIn which of the following energy is kinetic energy?
1. A bullet fired by a gun
2. A fast moving railway engine
3. Speed of a simple pendulum
1. A bullet fired by a gun
2. A fast moving railway engine
3. Speed of a simple pendulum
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Q279
Open questionA boy of 50 kg mass climbs 45 stairs in 10 seconds. If the height of each stair is 16cm then find his power?
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Q280
Open questionWhich of the following physical quantity measure the rate of work?
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