Home
Class 12
PHYSICS
Two identical metal plates are welded en...

Two identical metal plates are welded end to end as shown in - (i) . `20` cal of heat flows through it in `4` minutes. If the plates are welded as shown in figure-(ii) , find the time (in minutes) taken by the same amount of heat to flow through the plates.

Text Solution

Verified by Experts

The correct Answer is:
1 min
Rate of heat flow `(DeltaQ)/(Deltat) = (kA(T_(1)-T_(2)))/(l) implies Deltat prop (l)/(A)`
Promotional Banner

Topper's Solved these Questions

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE -01|65 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise EXERCISE -02|82 Videos

  • GEOMETRICAL OPTICS

    ALLEN |Exercise subjective|14 Videos

  • CURRENT ELECTRICITY

    ALLEN |Exercise EX.II|66 Videos

  • GRAVITATION

    ALLEN |Exercise EXERCISE 4|9 Videos

Similar Questions

Explore conceptually related problems

Two identical square rods of metal are welded end to end as shown in figure (i), 20 calories of heat flows through it in 4 minutes. If the rods are welded as shown in figure (ii), the same amount of heat will flow through the rods in

For the circuit shown in the following figure, determine the eqUivalent resistance between points A and B. Also find the current I flowing through the circuit.

A triangular plate has two cavities , one square and one rectangular as shown in figure . The plate is heated.

Two rectangular blocks, having identical dimensions, an be arranged either in configuration-I or in configuration-II as shown in the figure. One of the blocks has thermal conductivity k and the other 2k. The temperature difference between the ends along the x-axis is the same in both the configurations. It takes 9s to transport a certain amount of heat from the hot end to the cold end in the configuration-I. The time to transport the same amount of heat in the configuration-II is

The two ends of a metal rod are maintained at temperatures 100^(@)C and 110^(@)C . The rate of heat flow in the rod is found to be 4.0" Js"^(-1) . If the ends are maintained at temperatures 200^(@)C and 210^(@)C , the rate of heat flow will be :

A narrow monochromatic beam of light of intensity I is incident on a galss plate as shown in figure. Another identical glass plate is kept close to the first one & parallel to it. Each glass plate reflects 25% of the light incident on it and transmits the remaining find the ratio of the minimum & the maximum intensities in the interference pattern formed by the two beams obtained after one reflection at each plate.

An iron bar (L_(1) = 0.1 m , A_(1) = 0.02 m^(2), K_(1) = 79 W m^(-1) K^(-1)) and a brass bar (L_(2) = 0.1 m, A_(2) = 0.02 m^(2) , K_(2) = 109 W m^(-1) K^(-1)) are soldered end to end as shown in Fig. 11.16. The free ends of the iron bar and brass bar are maintained at 373 K and 273 K respectively. Obtain expressions for and hence compute (1) the temperature of the function of the two bars, (11) the equivalent thermal conductivity of the compound bar, and (111) the heat current through the compound bar.

An insulated cylinder is divided into three parts A, B and C. Pistons 1 and 2 are connected by a rigid rod and can slide without friction inside the cylinder. Piston 1 is perfectly conducting while piston 2 is perfectly insulating. Equal quantity of an ideal gas is filled in three compartments and the state of gas in every part is same (P_(0) V_(0) T_(0)) . Adiabatic exponent of the gas is g = 1.5. The compartment B is slowly given heat through a heater H such that the final volume of gas in part C becomes (4V_(0))/(9) (a) Calculate the heat supplied by the heater. (b) Calculate the amount of heat flow through piston 1. (c) If heater were in compartment A, instead of B how would your answers to (a) and (b) change?

Two speakers are driven by the same oscillator with frequency of 200 Hz. They are located 4 m part on a vertical pole. A man walks straight towards the lower speaker in a direction perpendicular to the pole, as shown in figure. (i) How many times will he hear a minimum in sound intensity, and (ii) how far is he from the pole and at these moments ? Take the speed of sound to be 330 m/s, and ignore any sound reflections coming off the ground. .

A container having base area A_(0) . Contains mercury upto a height l_(0) . At its bottom a thin tube of length 4l_(0) and cross-section area A(AltltA_(0) ) having lower end closed is attached . Initially the length of mercury in tube is 3l_(0) . in reamining part 2 mole of a gas at temperature T is closed as shown in figure . Determine the work done (in joule) by gas if all mercury is displaced from tube by heating slowly the gas in the rear end of the tube by means of a heater. (Given : density of mercury = rho , atmospheric pressure P_(0) = 2l_(0)rhog, C_(v) of gas = 3//2 R, A = (3//rho)m^(2), l_(0) = (1//9) m , all units is S.I. )

ALLEN -GEOMETRICAL OPTICS-SOME WORKED OUT EXAMPLES
  1. One mole of a monoatomic gas is enclosed in a cylinder and occupies a...

    Text Solution

    |

  2. Two taps A and B supply water at temperature 10^(@)C and 50^(@)C resp...

    Text Solution

    |

  3. Two identical metal plates are welded end to end as shown in - (i) . 2...

    Text Solution

    |

  4. Choose the correct mirror image of

    Text Solution

    |

  5. A point object O can move along vertical line AB as shown in figure . ...

    Text Solution

    |

  6. On one boundary of a swimming pool , there is a person at point A whos...

    Text Solution

    |

  7. A person has D cm wide face and his two eyes are separated by d cm. Th...

    Text Solution

    |

  8. If x and y denote the distance of the object and image from the focus ...

    Text Solution

    |

  9. A concave mirror forms an image I corresponding to a point object O . ...

    Text Solution

    |

  10. A man of height 2 m stands on a straight road on a hot day. The vertic...

    Text Solution

    |

  11. A system of coordinatees is drawn in a medium whose refractive index v...

    Text Solution

    |

  12. A ray of light in incident along a vector hati + hatj - hatk on a plan...

    Text Solution

    |

  13. A ray of light is incident in situation as shown in figure. Which...

    Text Solution

    |

  14. A fish lies at the bottom of a 4m deep water lake. A bird flies 6m abo...

    Text Solution

    |

  15. A plane mirror and an object has speeds of 5 m//s "and" 10 m//s respec...

    Text Solution

    |

  16. A ray of light travelling with a speed c leaves point 1 shown in figur...

    Text Solution

    |

  17. A ray of light travelling with a speed c leaves point 1 shown in figur...

    Text Solution

    |

  18. A ray of light travelling with a speed c leaves point 1 shown in figur...

    Text Solution

    |

  19. One hard and stormy night you find yourself lost in the forest when yo...

    Text Solution

    |

  20. One hard and stormy night you find yourself lost in the forest when yo...

    Text Solution

    |