Physics GK · all questions

Work, Energy and Power
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Q121

If two forces of 10 N and 5 N are applied in the same direction on an object, what will be the total force acting on the object?

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Q122

Find the potential energy of an object mass m raised from the ground level at a height of 4h-

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Q123

If an object of 10kg mass is moving at a speed of 2m/s, then kinetic energy of the object is-

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Q124

A man raised 20kg object from the surface of earth and put the object 2m above on his head. Calculate the work done by the man is- (g = 10 m/s²)

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Q125

If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by

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Q126

Which of the following position is no work done?

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Q127

What is the amount of work done when an object moves under a force of 10 N at a distance of 10 m in the direction of force?

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Q128

10 N force is working on an object. Object displaced 5m in the direction of applied force, then work done is-

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Q129

A worker raise 10kg object from the ground and put 1.2m above on his head then work done is- (g = 10 ms^-2)

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Q130

A bus runs with a force of 4000 N. The work done by the bus is 2000 J. What is the distance covered by the bus?

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Q131

Just before hitting the earth, the kinetic energy of an object of mass 2 kg is 400 J. At which height it was dropped?

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Q132

When an object move 1m distance by 1N force on the direction of force then work done will-

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Q133

A gun of mass 5 kg fires a bullet of mass 0.01 kg. If the initial velocity of bullet is 250 m/s then find the recoil velocity of gun.

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Q134

Mechanical energy is a combination of kinetic energy and-

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Q135

As an object falls freely its . . . . . . . .

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Q136

Calculate the potential energy obtained by a 20kg hammer, when it is raised to a height of 10m?

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Q137

A mobile was dropped from a balcony if the mass of the mobile phone is 0.5kg and the mobile phone was dropped from a height of 100m, g = 10m/s². So what is the potential energy of mobile phone?

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Q138

Efficiency of work is known as-

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Q139

A horizontal force of 10 N displaces an object of 5 kg to a distance of 2 m in the direction of the force. What will be the work done by the object?

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Q140

If the speed of a moving object is doubled . . . . . . . .

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