2: Problems Is points each] mol.K Gas constant R-8.31 Avogadro\'s number 602 x 1

Question

2: Problems Is points each] mol.K Gas constant R-8.31 Avogadro's number 602 x 10 atoms/moke Boltzmnn's constantk1.38 x 103 Jmk 24190 J/kg K) = 2220 J0kg K) 1 00 calig ) -0.530 cavig-C) Cce L water-2260 x 10* Jg-539 calg quote answers to the correct number of significant figures een poles35 0m apart on a 1. (a A copper telephone wire (with -170 x 10./C) has no sag bet Wday when the temperature is-200"C How much longer is the wire on a summer day winter the temperature is 32.0°C? window if the inside temperature is 21 C and the outside temperature is 5 C? The thermal conductivity of glass (b) A glass window 0.60 mm thick measures 75 cm by 50 cm. At what rate does heat flow through this 0.80 Wm.

Explanation / Answer

(a)

The length by which the wire is longer on a summer day is:

L = L••T

= 35m • 1.7 × 10-5 °C^-1 • (32°C - (-20°C))

= .03094m

= 3.094cm

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