Home
Class 11
PHYSICS
A block of mass 100g slides on a rough h...

A block of mass `100g` slides on a rough horizontal surface .If the speed of the block decreases from `10ms^(-1) to 5ms^(-1)`, find the thermal energy developed in the process

Text Solution

Verified by Experts

The correct Answer is:
C
Thermal energy developed `= change in K.E.
`= (1)/(2) xx (100)/(1000) xx 100- (1)/(2) xx (100)/(1000) xx 25`
= 5 - ((5)/(4)) = (15)/(4) = 3.75J`
Promotional Banner

Topper's Solved these Questions

  • CALORIMETRY

    HC VERMA|Exercise Objetive - II|6 Videos

  • CENTRE OF MASS, LINEAR MOMENTUM, COLLISION

    HC VERMA|Exercise Exercises|64 Videos

Similar Questions

Explore conceptually related problems

A block of mass 500 g is at rest on a horizontal table. What steady force is required to give the block a velocity of 200 cms^(-1) in 4 s?

The body of mass 400 g slides on a rough horizontal surface. If the frictional force is 3.0 N, find the angle made by the contact force on the body with the vertical. Take g=10 m/s^2

A block of mass m slides along a frictionless surface as shown in the figure. If it is releases from rest from A what is its speed at B?

A bullet of mass 20g enters into a fixed wooden block with a speed of 40 ms^(-1) and stops in it .Find the change in internal energy during the process

A block of mass 2.5 kg is kept on a rough horizontal surface. It is found that the block does not slide if a horizontal force less than 15 N is applied to it. Also it is found that it takes 5 seconds to slide through the first 10 m if a horizontal force of 15 N is applied and the block is gently pushed to start the motion. Taking g=10 m/s^2 , calculate the coefficient of static and kinetic friction between the block and the surface.

A block of mass M is kept on as rough horizontal surface. The coefficient of static frictionbetween the block and the surface is mu . The block is to be pulled by applying a force to it. What minimum force is needed to slide the block? In which direction should this force act?

A bullet of mass 20 g travelling horizontally with a speed of 500 m/s passes through a wooden block of mass 10.0 kg initially at rest on a level surface. The bulet emerges with speed of 100 m/s and the block slides 20 cm on the surface before coming to rest. Find the friction cioefficient between the block and the surface figure.

A body of mass 2kg is resting on a rough horizontal surface. A force of 20N is now applied to it for 10s, parallel to the surface. If the coefficient of kinetic friction between the surfaces of contact is 0.2. Calculate change in kinetic energy of the object in 10s. (Take g=10ms^(-2) ).

All the surfaces shown in figure are assumed to be frictionless. The block of mass m slides on the prism which in turn slides backward on the horizontal surface. Find the acceleration of the smaller block with respect to the prism.

HC VERMA-CALORIMETRY-Exercises
  1. An aluminium vessel of mass 0.5kg contains 0.2kg of water at 20^(@)C A...

    Text Solution

    |

  2. A piece of iron of mass 100g is kept inside a furnace for a long time ...

    Text Solution

    |

  3. The temperature of equal masses of three different liquids A ,B and C ...

    Text Solution

    |

  4. Four 2 cmxx2 cmxx 2cm cubes of ice are taken from a refrigerator and p...

    Text Solution

    |

  5. Indian style of cooling drinking water is to keep it in a pitcher havi...

    Text Solution

    |

  6. A cube of iron (density= 8000kg m^(-1), specific heat capacity = 470g ...

    Text Solution

    |

  7. 1kg ice at 0^(@)C is mixed with 1kg of steam at 100^(@)C. What will be...

    Text Solution

    |

  8. Calculate the time required to heat 20kg of water from 10^(@)C to 35^(...

    Text Solution

    |

  9. The number of molecules in a drop of water (0.0018 ml) at room tempera...

    Text Solution

    |

  10. A bullet of mass 20g enters into a fixed wooden block with a speed of ...

    Text Solution

    |

  11. A 50 kg man is running at a speed of 18 kmh^(-1) If all the kinetic en...

    Text Solution

    |

  12. A brick weighing 4.0 kg is dropped into a 1.0m deep river from a heigh...

    Text Solution

    |

  13. A van of mass 1500kg travelling at a speed of 15 m/s is stopped in 10...

    Text Solution

    |

  14. A block of mass 100g slides on a rough horizontal surface .If the spee...

    Text Solution

    |

  15. A 10kg ball and 20kg ball approach each other with velocities 20ms^(-1...

    Text Solution

    |

  16. A ball is dropped on a floor from a height of 2.0m After the collision...

    Text Solution

    |

  17. A copper cube of mass 200g slides down an a rough inclined plane of in...

    Text Solution

    |

  18. A metal block of density 6000 kg m^(-3) and mass 1.2 kg is suspended t...

    Text Solution

    |