8. Suppose a copper wire is wound around the equator of aperfectly spherical ear

Question

8. Suppose a copper wire is wound around the equator of aperfectly spherical earth, so that it just fits snugly at 25°C.If the tem­perature of the wire now increases to 40°C,causing the wire to increase in length. The wire is now a largercircle, centered on the center of the earth. How high above theground is the wire now?      (Radius ofearth = 6.4 x 106m, coefficient of thermal expansion for copper, a= 17 x 10-6/C°)

9. How much heat is given off by 0.25 kg of steam at 190°Cas it condenses to water at 100°C? Take the specific heatcapacity of steam to be cs = 3000 J/kg C°, and thelatent heat of vaporization of water to be Lv = 22.6 X105 J/kg.

Explanation / Answer

8) We know that         L = Lo T            =2R T            = 2 *3.14 * 6.4 x 106 * 17 x 10-6 * (40-25)            =10248.96 m 9) Q = msT + mL            = 0.25* 3000 * 90 + 0.25 * 22.6 x 105            =632500 J

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