Tag: transfer of heat
Questions Related to transfer of heat
The purpose of using vacuum flask is to store
A themoflask prevent heat loss from-
In which of the following process, convection does not takes place primarily?
A double-plane window consist of two glass sheets each of area $1m^2$ and thickness $0.01m$ separated by a $0.05m$ thick stagnant air space In the steady state, the room glass interface and the glass outdoor interface are at constant temperature of $27^oC$ and $0^oC$ respectively. The rate of heat flow through the window plane is (Given , $k _{glass}=0.8\,\,W\,\,m^{-1}K^{-1},K _{air}=0.08\,\,W\,\,m^{-1}K^{-1})$
A 1200 kg car is braked to a stop from 100 km/h. If 60% of this energy appears in the steel brake drums, whose total mass is 10 kg its temperature will rise by $\left( s _ { \text { steel } } = 450 \mathrm { J } / \mathrm { kg } \mathrm { K } \right)$
While measuring the thermal conductivity of liquids, the upper part is kept hot and lower one cool so that :
Fireman crawl when entering a burning building because:
Convection of heat takes place in:
Birds glide effortlessly in the air with the help of
It is hotter at the same distance over the top of a fire than it is on the side of it mainly because