हिंदी

Choose one or more correct alternatives. Joule is the unit of ______. force work power energy

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प्रश्न

Choose one or more correct alternatives.

Joule is the unit of ______.

  1. force
  2. work
  3. power
  4. energy
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उत्तर

Joule is the unit of work and energy.

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  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 2: Work and Energy - Exercises [पृष्ठ २८]

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बालभारती Science and Technology [English] Standard 9 Maharashtra State
अध्याय 2 Work and Energy
Exercises | Q 2. b. | पृष्ठ २८

संबंधित प्रश्न

Work done = Force × ........................................


A boy of weight 40 kgf climbs up the 15 steps, each 15 cm high in 10 s and a girl of weight 20 kgf does the same in 5 s. Compare:

  1. the work done, and
  2. the power developed by them. Take g = 10 N kg-1.

What is the work done against gravity when a body is moved horizontally along a frictionless surface?


Is it possible that a force is acting on a body but still the work done is zero? Explain giving one example.


A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.


Name the physical quantity whose SI unit is Nm.


A man carrying a suitcase in his hand is walking horizontally. What is the work done against gravity?


Write an expression for work done by a force depends?


No work is done by a man moving on a horizontal road while carrying a box on his head. Explain.


What are the physical parameters on which the kinetic energy of a body depends?

Is P.E. a vector or a scalar quantity?

Name the CGS unit of work.


Name the unit of energy.

The truck has to apply a force of 3000 N to overcome friction while moving with a uniform speed of 36 kmhr−1. What is the power developed by the truck?

Fill in the boxe to show the corresponding energy transformation.


A body of mass 60 kg has the momentum 3000 kgm/s-1. Calculate:  the speed of the body.


A truck driver can load oil drums into the back of the truck by pushing them up a sloping plank, or by lifting them directly. Each drum has a mass of 80 kg, the plank is 3 m long, and the back of the truck is 0.8 m above the ground.

(i) How much force would be needed to lift a drum into the truck directly/without using the plank? (Take g = 10 m/s2)

(ii) How much energy would be required in lifting the drum into the truck without the plank?

(iii) If the force needed to push the drum up the plank is 300 N, why is this less than the answer to part (i)?

(iv) When the truck is loaded, the driver drives off. List the major energy changes that take place in moving the truck.

(v) The driver has to stop at the factory gates. What happens to the kinetic energy of the truck?


The weights of two bodies are 2.0 N and 2.0 kgf respectively what is the mass of each body?


________ is said to be done when a force is acting on it.


A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.


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