Athin metal bar, insulated along its sides, is composed of five different metal connected together. the left end bar is immersed in a heat bath at 100°c and right end in a heat bath at 0°c. starting at the left end, the pieces and lenghts are steel(2cm), brass(3cm), copper(1cm), aluminum(5cm) and silver(1cm). what is the temperature of the steel/brass interface?

T = 61.06 °C  

Explanation:

given data:

a thin metal bar consist of 5 different material.

thermal conductivity of ---

K {steel} = 16 Wm^{-1} k^{-1}

K brass = 125 Wm^{-1} k^{-1}

K copper = 401 Wm^{-1} k^{-1}

K aluminium =30Wm^{-1} k^{-1}

K silver = 427 Wm^{-1} k^{-1}

WE KNOW THAT

total resistance of bar = R steel + R brass + R copper + R aluminium + R silver

let T is the temperature at steel/brass interference

will be constant throughtout the bar

therefore we have

solving for T  we get

T = 61.06 °C  

it doesn't. it was imagined up in the middle ages.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.