Home
Class 9
PHYSICS
We come across various activities which ...

We come across various activities which we normally consider to be work in day-to-day life.
for each of these activities, ask the following questions and answer them :
Who (What) is doing work?

Text Solution

Verified by Experts

The one exerting the force is doing work.
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    KUMAR PRAKASHAN|Exercise ACTIVITY 11.3|4 Videos

  • WORK AND ENERGY

    KUMAR PRAKASHAN|Exercise ACTIVITY 11.4|4 Videos

  • SOUND

    KUMAR PRAKASHAN|Exercise QUESTIONS AND ANSWERS (Additional numericals for practice)|16 Videos

Similar Questions

Explore conceptually related problems

We come across various activities which we normally consider to be work in day-to-day life. for each of these activities, ask the following questions and answer them : What is the work being done on?

We come across various activities which we normally consider to be work in day-to-day life. for each of these activities, ask the following questions and answer them : What is happening to the object?

In an experiment to estimate the size of a molecule of oleic acid 1 mL of oleic acid is dissolved in 19 ml of alcohol. Then I mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow through. The solution spreads over the surface of water forming one molecule thick layer. Now lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule. Read the passage carefully and answer the following questions. (a) Why do we dissolve oleic acid in alcohol ? (b) What is the role of lycopodium powder ? (c) What would be the volume of oleic acid in each ml of solution prepared ? (d) How will you calculate the volume of n drops of this solution of oleic acid ? (e) What will be the volume of oleic acid in one drop of this solution ?

KUMAR PRAKASHAN-WORK AND ENERGY -QUESTION & ANSWER (ADDITIONAL NUMERICALS FOR PRACTICE)
  1. We come across various activities which we normally consider to be wor...

    Text Solution

    |

  2. A body of mas 15 kg undergoes downward displacement of 40 m under the ...

    Text Solution

    |

  3. An object of mass 120g is taken upward at the height 5 m, then ………….. ...

    Text Solution

    |

  4. At what speed a person having 60 kg mass should run to acquire 750 J k...

    Text Solution

    |

  5. Kinetic energy of a car, having mass 1000 kg is 1,12,500 J. Driver app...

    Text Solution

    |

  6. Hetasvi, having her own mass 50 kg, climbs 20 m height along with 30 k...

    Text Solution

    |

  7. 5 tubelights each of 40 W are operated by 10 hour. Calculate electrica...

    Text Solution

    |

  8. A boy of mass 40 kg climbs a staircase of 30 steps, each of 0.2 m heig...

    Text Solution

    |

  9. A lady pulls a bucket filled with water having mass 10kg from a well 8...

    Text Solution

    |

  10. A car having mass 1000 kg is moving with speed of 36kmh^(-1). Calculat...

    Text Solution

    |

  11. The pendulum shown in the figure is kept horizontal. It is released fr...

    Text Solution

    |

  12. In a residence 4 tubelights each of 40W are operated daily for 5 hour ...

    Text Solution

    |

  13. A rocket is moving in upward direction with the velocity v, suddenly i...

    Text Solution

    |

  14. Avinash is moving with the velocity 8ms^(-1) against the frictional fo...

    Text Solution

    |

  15. The power of a water pump is 2 kW. How much amount of water can it rai...

    Text Solution

    |

  16. Suppose the weight of a man on the planet A is half than that on the e...

    Text Solution

    |

  17. A ball is falling freely from the height 10 m. On striking the ground ...

    Text Solution

    |

  18. The power of an electric iron is 1200 W. It is used daily for 30 minut...

    Text Solution

    |

  19. The momentam of a light and heavy objects are same. Find the ratio of ...

    Text Solution

    |

  20. Car A of mass 1000 kg moves on a horizontal straight road with speed 3...

    Text Solution

    |

  21. A girl of mass 35 kg is sitting in a trolley of mass 5 kg. By applying...

    Text Solution

    |