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महाराष्ट्र राज्य शिक्षण मंडळएस.एस.सी (मराठी सेमी-इंग्रजी) इयत्ता ९ वी

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
रिकाम्या जागा भरा
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उत्तर

Joule is the unit of work and energy.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 2: Work and Energy - Exercises [पृष्ठ २८]

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

संबंधित प्रश्‍न

Define 1 J of work.


No work is done by a force if the body


A coolie is moving on a road with a luggage on his head. Does he perform work against the force of gravity? Give reason for your answer.


A car is running at a speed of 15 km h-1 while another similar car is moving at a speed of 45 km h-1. Find the ratio of their kinetic energies.


Give one example in which a force does zero work.


In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?


The work done on an object does not depend on the :


Determine the amount of work done when an object is displaced at an angle of 30° with respect to the direction of the applied force.


What are the factors on which P.E. of a body depends?

Name the type of energy possessed by a body due to a change in configuration.

What is meant by power?

Define the unit 'watt'. How is it related to horse power?

A body is pivoted at a point. A force of 10 N is applied at a distance of 30 cm from the pivot. Find the moment of force about the pivot.

State the energy changes which take place when A toy car with a wound spring moves on ground.


Give an example 

Electrical energy changes to heat energy.


A bullet of mass 25 g has a velocity of 600 ms-1. What is the kinetic energy of the bullet? If it penetrates 50 cm into a target, find the resistive force offered by the target.

A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.


In what way does an ‘Ideal machine’ differ from a ‘Practical machine’?


An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).


Write the two main conditions are needed for work to be done?


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