Home
Class 11
PHYSICS
The thickness of a brick wall is 0.25m. ...

The thickness of a brick wall is 0.25m. The temperatures inside and outside or `24^(@)` C and `42^(@)`C. Given Thermal conductivity of brick = 0.15`Wm^(-1)K^(-1)` , then calculate the total amount of heat conducted in a time interval of 30 minutes due to a 25`m^2` wall.

Text Solution

Verified by Experts

Given :
`d=0.25mtheta_1-theta_2=42^(@)C-24^(@)C=18^(@)C,A=25m^2,K=0.15Wm^(-1)K^(-1),t=30xx60=1800s`
We know that `Q=(KA(theta_1-theta_2)t)/d`
i.e `Q=(0.8xx25xx18xx1800)/(0.25)`
`Q=2.592xx10^6J` (Sufficient enough to boil 1Kg of water into steam)
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER

    SUBHASH PUBLICATION|Exercise THREE MARKS QUESTIONS AND ANSWERS|12 Videos

  • SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

    SUBHASH PUBLICATION|Exercise NUMERICAL WITH SOLUTIONS|34 Videos

  • THERMODYNAMICS

    SUBHASH PUBLICATION|Exercise NUMERICALS WITH SOLUTIONS|24 Videos

Similar Questions

Explore conceptually related problems

At what rate a layer of ice will be formed if the surrounding temperature is at -10^(@)C ? Thermal conductivity of ice =1.6Wm^(-1)K^(-1) . Initial thickness of ice is 1mm

A cubical ice box of thermocol has each side 30 cm and thickness 5 cm , 4 kg of ice is put in the box , if outside temperature is 45^(@)C and coefficient of thermal conductivity is 0.01 J s^(-1) m^(-1) K^(-1) . Calculate the mass of ice left after 6 hrs . Take latent heat of fusion of ice as 335 xx 10^(3) JK^(-1)

A' thermacole' icebox is a cheap and an efficient method for storing small quantities of cooked food in summer in particular. A cubical icebox of side 30 cm has a thickness of 5.0 cm. "if "4.0 kg of ice is put in the box, estimate the amount of Ice remaining after 6 h. The outside temperature is 45^(@) C and co-efficient of thermal conductivity of thermacole is 0.01 J s^(-1) m^(-1) K^(-1) . [Heat of fusion of water = 335 xx 10^(3) J kg^(-1) ]

The resistance of a 0.01 N solution of an electrolyte was found to 210 ohm at 25^(@)C using a conductance cell with a cell constant 0.88 cm^(-1) . Calculate the specific conductance and equivalent conductance of the solution.

If the thermal conductivity of the material of a conductor is 375 W m^(-1)K^(-1) , then calculate the thermal resistance of a 20 mm thick and 1.5 m length of the rod. If an identically shaped rod but of thermal conductivity 600 Wm^(-1)K^(-1) is connected in (1) series and (2) parallel, then calculate the effective conductivities of the combinations.

Steam at 373 K is passed through a tube of radius 10 cm and length 2 m. The thickness of the tube is 5 mm and thermal conductivity of the material is 390 W m^(-1) K^(-1). The outside temperature is 0C. The heat lost per second in J is

One end of a thick copper rod is immersed into a steam chamber and the other end h:as metal coiled tube through which cold water at 15^(@) C is circulated. · If the length of the rod is 0.30 m, thickness 0.04 m, K of copper is 375 Wm^(-1) K^(-1) and specific heat of water 4200 Jkg^(-1)K^(-1) , then calculate the final temperature of 0.10 kg of water at the end of 10 minutes, the temperatllre at the other end being 80^(@) C.

A brass boiler has a base area of 0.15m^2 and thickness 1 cm. It boils water at the rate of 6 kg per minute when placed on a gas stove. Estimate the temperature of the part of the flame in contact with the boiler. Thermal conductivity of brass is =109Js^(-1)m^(-1)K^(-1) , Heat of vapourisation of water is 2256xx10^3Jkg^(-1)

Two vessels of different materials are identical in size and wall thickness. They are filled with equal quantities of ice at 0°C. The ratio of their thermal conductivities is 5 : 2. If it takes 10 minutess for the ice to melt in the first vessel, then find what time the ice in the vessel takes to melt.

SUBHASH PUBLICATION-THERMAL PROPERTIES OF MATTER-FOUR MARKS QUESTIONS AND ANSWERS
  1. Given that molar specific heats of gas at' constant pressure and volum...

    Text Solution

    |

  2. Two metal rods made up of iron (K1=79Wm^(-1)K^(-1)) and brass (K2=109W...

    Text Solution

    |

  3. The thickness of a brick wall is 0.25m. The temperatures inside and ou...

    Text Solution

    |

  4. Find the amount of heat required to convert 10 kg ice at -10^(@)C to w...

    Text Solution

    |

  5. A body cools from 80^(@)C to 50^(@)C in 5 minutes. Calculate the time ...

    Text Solution

    |

  6. A cubical ice box of thermocol has each side 30 cm and thickness 5 cm ...

    Text Solution

    |

  7. A brass boiler has a base area of 0.15m^2 and thickness 1 cm. It boils...

    Text Solution

    |

  8. Estimate the temperature on the surface of the Sun from the following ...

    Text Solution

    |

  9. A body cools from 80^(@)C to 50^(@)C in 5 minutes. Calculate the time ...

    Text Solution

    |

  10. Sun emits maximum radiant energy at 5461A and Moon at 10mum. If the su...

    Text Solution

    |

  11. Luminosity of a distant star is 16000 times that of the Sun. If the su...

    Text Solution

    |

  12. The thickness of a filament wire is 0.15 mm and length 10 cm. The fila...

    Text Solution

    |

  13. A small cavity of diameter 2 mm whose temperature is 3000K acts as a b...

    Text Solution

    |

  14. Two vessels of different materials are identical in size and wall thic...

    Text Solution

    |

  15. At what rate a layer of ice will be formed if the surrounding temperat...

    Text Solution

    |

  16. Initial ice layer on a pond is 10 mm. What time will it take to form a...

    Text Solution

    |

  17. One end of a thick copper rod is immersed into a steam chamber and the...

    Text Solution

    |

  18. If the thermal conductivity of the material of a conductor is 375 W m^...

    Text Solution

    |

  19. A copper plate has an area of 250 cm^2 at 0^(@) C. Calculate the area ...

    Text Solution

    |

  20. A brass boiler has a base area of 0.15m^2 and thickness 1 cm. It boils...

    Text Solution

    |