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Suppose the bent part of the frame of th...

Suppose the bent part of the frame of the previous problem has a thermal conductivity of `780s^(-1)m^(-1)`^(@)C^(-1)` whereas it is `390Js^(-1)m^(-1)`^(@)C^(-1)` for the staight the bent part to the rate of heat flow through the staight part.

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The correct Answer is:
A, B
`(Q/t)_(Bent)=(780xxAxx100)/70`
`(Q/t)_(Straight)=(390xxAxx100)/70`
`((Q/t)_(Bent))/((Q/t)_(Straight))=(780xxAxx100)/70`
`xx60/(390xxAxx100)=12/7`
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HC VERMA-HEAT TRANSFER-Exercises
  1. Figure shows an aluminium rod joined to a copper rod. Each of the rods...

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  2. Conside the situation shown in figure. The frame is made of the same m...

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  3. Suppose the bent part of the frame of the previous problem has a therm...

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  4. A room has s window fitted with a single 0.1mxx2.0m glass of thickness...

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  5. The two rods show in figure have identical geomerical dimension.. They...

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  6. Four identical rods AB, CD, CF and DE are joined as shown in figure. T...

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  7. Seven rods A, B, C, D, E, F and G are joined as shown in figure. All t...

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  8. Find the rate of heat flow through a cross section of the rod shown in...

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  9. A rod of negligible heat capacity has length 20cm, area of cross secti...

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  10. A hollow metallic sphere of radius 20cm surrounds a concentric metalli...

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  11. Figure shown two adiabatic vessels, each containing a mass m of water ...

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  12. Two bodies of masses m(1) and m(2) and specific heat capacities S(1) a...

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  13. An amount n (in moles) of a monatomic gas at initial temperature T(0) ...

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  14. Assume that the total surface area of a human body is 1-6m^(2) and tha...

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  15. Calculate the amount of heat radiated per second by a body of surface ...

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  16. A solid aluminium sphere and a solid copper sphere of twice the radius...

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  17. A 100W bulb has tungsten filament of total length 1.0m and radius 4xx1...

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  18. A spherical ball of surface area 20cm^(@) absorbs any radiation that f...

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  19. A spherical tungsten pices of radius 1.0cm is suspended in an evacuate...

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  20. A cubical block of mass 1.0kg and edge 5.0cm is heated to 227^(@)C . I...

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