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A wooden sphere of diameter 5 cm is initially at a uniform temperature of 2 1 you C . Its surface temperature is suddenly

A wooden sphere of diameter

5

cm is initially at a uniform temperature of

21 \\

you C

.

Its surface

temperature is suddenly raised to

83 \\

you C

.

The thermal conductivity and thermal diffusivity of

the wood are

0.15

/

m K and

0.82

10 - 7

2

/

,

respectively.

)

Calculate the temperature

2

cm beneath the surface of the sphere

30

min after the

sudden increase in temperature.

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