Home
Class 9
PHYSICS
In an experiment to measure his power, a...

In an experiment to measure his power, a student records the time taken by him in running up a flight of steps on a staircase. Use the following data to calculate the power of the student :
Number of steps = 28
Height of each step = 20 cm
Time taken = 5.4 s
Mass of student = 55 kg
Acceleration = `9.8 m s^(-2)`
due to gravity

Text Solution

Verified by Experts

The correct Answer is:
559 W
NA
Promotional Banner

Topper's Solved these Questions

  • WORK AND ENERGY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Long Answer Type Questions|2 Videos

  • WORK AND ENERGY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Multiple Choice Questions|1 Videos

  • WORK AND ENERGY

    LAKHMIR SINGH & MANJIT KAUR|Exercise Multiple Choice Questions|1 Videos

  • SOUND

    LAKHMIR SINGH & MANJIT KAUR|Exercise Value Based Questions|20 Videos
LAKHMIR SINGH & MANJIT KAUR-WORK AND ENERGY-Exercise
  1. The following data was obtained for a body of mass 1 kg dropped from a...

    Text Solution

    |

  2. A ball falls to the ground as shown below : (a) What is the kinet...

    Text Solution

    |

  3. In an experiment to measure his power, a student records the time take...

    Text Solution

    |

  4. In loading a truck, a man lifts boxes of 100 N each through a height o...

    Text Solution

    |

  5. Name the energy transfers which occur when : (a) an electric bell ri...

    Text Solution

    |

  6. A force of 7 N acts on an object. The displacement is, say 8 m, in the...

    Text Solution

    |

  7. When do we say that work is done ?

    Text Solution

    |

  8. Write an expression for the work done when a force is acting on an obj...

    Text Solution

    |

  9. Define 1 J of work.

    Text Solution

    |

  10. A pair of bullocks exerts a force of 140 N on a plough. The field bei...

    Text Solution

    |

  11. What is the kinetic energy of an object ?

    Text Solution

    |

  12. Write an expression for kinetic energy of an object.

    Text Solution

    |

  13. The kinetic energy of an object of mass m moving with a velocity of 5 ...

    Text Solution

    |

  14. What is power ?

    Text Solution

    |

  15. Define 1 W of power.

    Text Solution

    |

  16. A lamp consumes 1000 J of electrical energy is 10 s. What is its power...

    Text Solution

    |

  17. Define avarage power.

    Text Solution

    |

  18. Look at the activites listed below. Reason out whether or not work is ...

    Text Solution

    |

  19. An object thrown at a certain angle to the ground moves in a curved pa...

    Text Solution

    |

  20. A battery lights a bulb. Describe the energy changes involved in the p...

    Text Solution

    |