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# Graded Discussion Board (GDB) PHY101

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### Replies to This Discussion

لازم نہیں ہے

میں تاریخ گزرنے کے بعد یہاں مکمّل اور مستند جواب شایع کروں گا

sir plz aj last date ha us GDB ka bara mai koi help ya hint dy dy plz

Heat aik khas kism ki energy hoti hae jo k high temperature se low temperature system ki tarf flow karti hae. esko flow of internal energy bhi kaha jata hae.

kisi bhi chiz ka garm ya sard hona oske heat capacity pe munhaser hae. koi jism garm ya sard tab hota hae jub oske under heat ko obsorb karne ki jitni salahiyat ho. agar woh ziada heat absorb karsakta hae to woh utna dair se garm ya thanda hoga.

pani m heat capacity sub se ziada hae. steel m 448 jab k copper m 387 joules per kg.Kelvin hae.

ooper diyi gaye options m copper sub se ziada thanda hoga pher steel aur akhair m concrete ki dewaar. concrete ki heat capacity 880 hae.

Copper is colder then others when we touch one of the walls, heat flows from our hands to the lower-temperature wall. The more rapidly heat flows from our hand, the colder we will feel. Recall that the rate of heat flow is proportional to the thermal conductivity. also that, copper has a much higher thermal conductivity (385.0W/m'K) than steel (50.2W/m'K) or concrete (0.8 W/m. K), and so the copper wall feels the coldest to the touch.
Q= kA (T hot - T cold) / L

when you touch one of the walls, heat flows from your hand to the lower-temperature wall. The more rapidly heat flows from your hand, the colder you will feel. Recall that the rate of heat flow is proportional to the thermal conductivity. Note also that, copper has a much higher thermal conductivity (385.0W/m'K) than steel (50.2W/m'K) or concrete (0.8 W/m. K), and so the copper wall feels the coldest to the touch. enjoy

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