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Two black discs each of diameter 50 cm are placed parallel to each other concentrically at a distance of one meter. The discs are maintained at 1000 K and 500 K. Calculate the heat flow between the discs when no other surface is present
Two black discs each of diameter 50 cm are placed parallel to each other concentrically at a distance of one meter. The discs are maintained at 1000 K and 500 K. Calculate the heat flow between the discs when the disks are connected by a cylindrical black no-flux surface
Some tapes are discs. Some discs are cassettes. Some cassettes are songs Conclusions: 1. Some songs are discs 2. Some cassettes are tapes 3. Some songs are tapes 4. No song is a disc
Statements : Some tapes are discs. Some discs are cassettes. Some cassettes are songs.

Conclusions :
I. Some songs are discs.
II. Some cassettes are tapes.
III. Some songs are tapes.
IV. No song is a disc.
Circular metal discs of diameter 8 cm and width 2.5 cm were placed one on top of another to form a cylinder. How many metal discs will be required to form a cylinder of volume 640π cm2?
Which discs are virtually extinct now and have been replaced by compact discs (CDs) since many years due to numerous advantages they offer?
Consider the following statements regarding suspension cables: 1) The horizontal component of the cable tension in a suspension bridge is constant at every point along the length of the cable 2) Stiffening girders in a suspension bridge carry only the live load Which of the above statements is/are correct?
Three identical discs have one side painted in blue color and the other in green color. These three discs are tossed simultaneously. What is the probability of getting more blue faces than the green faces, when tossed?
Consider an enclosure formed by three surfaces having the following values of shape factors, emissivities and temperatures Surface 1 i.e. curved cylindrical has an emissivity 0.75 and temperature 800 K Surface 2 i.e. closing disc has an emissivity 0.8 and temperature 700 K Surface 3 i.e. closing disc has an emissivity 0.8 and temperature 700 K The closing flat discs are 25 mm in diameter and they have interspacing distance equal to 100 mm. If the shape factor between these two identical discs is 0.05, calculate the net rate of radiant heat flow from the curve surface to each of the closing end surface
In case of a multiple disc clutch, if n1 are the number of discs on the driving shaft and n2 are the number of the discs on the driven shaft, then the number of pairs of contact surfaces will be