Home
Class 12
PHYSICS
Answer the following questions: Why are ...

Answer the following questions: Why are the brake-drums of a car heated when the car moves down a hill at constant speed ?

Text Solution

Verified by Experts

Here the speed of the car is not increasing, the gravitational potential energy is converted into internal energy (heat) of the break-drum which are heated
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER (HEAT TRANSFER)

    MBD PUBLICATION|Exercise QUESTION BANK|217 Videos

  • VECTOR ANALYSIS

    MBD PUBLICATION|Exercise QUESTION BANK|250 Videos

Similar Questions

Explore conceptually related problems

Answer the following question in one word only. What is called when F_1 pollens are pollinated in the stigma of the same flower?

A strip of nickel metal is dipped in a 1 molar solution of Ni (NO_(3))_(2) and a strip of silver metal is dipped in a 1 molar solution of AgNO_(3) . An electrochemical cell is created when the two solutions are joined by salt bridge and two strips are joined by wire to a voltmeter. Answer the following questions. Write the balanced equation for the overall cell reaction and calculate the cell potential.

Answer the following questions on the basis of the curve given below for a first order reaction. R to P If the slope is 2 xx 10^(-4) " s"^(-1) , then calculate the rate constant.

Answer the following questions on the basis of the curve given below for a first order reaction. R to P Find the relation between slope of this line and rate constant.

MBD PUBLICATION-THERMODYNAMICS-QUESTION BANK
  1. Answer the following questions: A piece of lead is hammered. Does the ...

    Text Solution

    |

  2. Answer the following questions: A hot piece of iron is immersed in col...

    Text Solution

    |

  3. Answer the following questions: Why are the brake-drums of a car heate...

    Text Solution

    |

  4. Answer the following questions: Two balls of the same metal having mas...

    Text Solution

    |

  5. Answer the following questions: An ideal gas is compressed ate consta...

    Text Solution

    |

  6. Answer the following questions: How the internal energy of an ideal g...

    Text Solution

    |

  7. If an inflated tyer bursts, the air escaping out is cooled, why ?

    Text Solution

    |

  8. The internal energy of a compressed gas is less than that of a rarefie...

    Text Solution

    |

  9. Equal mass of the helium and oxygen gases are given equal quantities o...

    Text Solution

    |

  10. Absolute zero temperature is not the temperature of zero energy, expla...

    Text Solution

    |

  11. Is it possible that there is a change in temperature of a body without...

    Text Solution

    |

  12. Is it possible that there is no increase in the temperature of a body ...

    Text Solution

    |

  13. If hot air rises, why is it cooler at the top of a mountain than near ...

    Text Solution

    |

  14. A thermos bottle containing coffee is vigorously shaken. Consider coff...

    Text Solution

    |

  15. A thermos bottle containing coffee is vigorously shaken. Consider coff...

    Text Solution

    |

  16. A thermos bottle containing coffee is vigorously shaken. Consider coff...

    Text Solution

    |

  17. A thermos bottle containing coffee is vigorously shaken. Consider cof...

    Text Solution

    |

  18. A box with rigid instating walls is divided into two parts by a partit...

    Text Solution

    |

  19. Can a room be cooled by leaving the door of an electric refrigerator o...

    Text Solution

    |

  20. Milk is poured into a cup of tea and is mixed with a spoon. Is this an...

    Text Solution

    |