Gravitational force is required for
Stirring of liquid
Convection
Conduction
Radiation
(b)
Gravity is required for convection.
A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling
Which of the following material is most suitable for cooking utensil?
Two rods of same length and same area of cross section are joined
Temperature of two ends are as shown in figure. As we move along the rod, temperature are as shown in following
Two rods $A$ and $B$ of same cross-sectional are $A$ and length $l$ connected in series between a source $(T_1 = 100^o C)$ and a sink $(T_2 = 0^o C)$ as shown in figure. The rod is laterally insulated If $T_A$ and $T_B$ are the temperature drops across the rod $A$ and $B$, then
Star$ S_1$ emits maximum radiation of wavelength $420$ $nm$ and the star $S_2$ emits maximum radiation of wavelength $560 \,\,nm$, what is the ratio of the temperature of $S_1$ and $S_2$ :
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