146453 A horizontal fire hose with a nozzle of crosssectional area $\frac{5}{\sqrt{21}} \times 10^{-3} \mathrm{~m}^{2}$ delivers a cubic meter of water in $10 \mathrm{~s}$. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

146454 Two black bodies $A$ and $B$ have equal surface areas and are maintained at temperatures $27^{\circ} \mathrm{C}$ and $177^{\circ} \mathrm{C}$ respectively. What will be the ratio of the thermal energy radiated per second by $A$ to that by $B$ ?

146456 A wire has resistance of $3.1 \Omega$ at $30{ }^{\circ} \mathrm{C}$ and 4.5 $\Omega$ at $100{ }^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is

146457 A sphere at $600 \mathrm{~K}$ is losing heat due to radiation. At this temperature its rate of cooling is $R$. The rate of cooling of this sphere at $400 \mathrm{~K}$ is (temperature of surroundings is 200 K)

146458 Two identical shaped metallic spheres $A$ and $B$ made up of same material of mass ' $m$ ' and ' $4 \mathrm{~m}$ ' are heated to attain a temperature $T_{1}$ and then they are placed in a container maintained at temperature $T_{2}\left(T_{2} \lt T_{1}\right)$. The spheres are thermally insulated from each other. If $R$ is the rate of change of temperature, then the ratio $\mathbf{R}_{A} \& \mathbf{R}_{B}$ is

146453 A horizontal fire hose with a nozzle of crosssectional area $\frac{5}{\sqrt{21}} \times 10^{-3} \mathrm{~m}^{2}$ delivers a cubic meter of water in $10 \mathrm{~s}$. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

146454 Two black bodies $A$ and $B$ have equal surface areas and are maintained at temperatures $27^{\circ} \mathrm{C}$ and $177^{\circ} \mathrm{C}$ respectively. What will be the ratio of the thermal energy radiated per second by $A$ to that by $B$ ?

146456 A wire has resistance of $3.1 \Omega$ at $30{ }^{\circ} \mathrm{C}$ and 4.5 $\Omega$ at $100{ }^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is

146457 A sphere at $600 \mathrm{~K}$ is losing heat due to radiation. At this temperature its rate of cooling is $R$. The rate of cooling of this sphere at $400 \mathrm{~K}$ is (temperature of surroundings is 200 K)

146458 Two identical shaped metallic spheres $A$ and $B$ made up of same material of mass ' $m$ ' and ' $4 \mathrm{~m}$ ' are heated to attain a temperature $T_{1}$ and then they are placed in a container maintained at temperature $T_{2}\left(T_{2} \lt T_{1}\right)$. The spheres are thermally insulated from each other. If $R$ is the rate of change of temperature, then the ratio $\mathbf{R}_{A} \& \mathbf{R}_{B}$ is

146453 A horizontal fire hose with a nozzle of crosssectional area $\frac{5}{\sqrt{21}} \times 10^{-3} \mathrm{~m}^{2}$ delivers a cubic meter of water in $10 \mathrm{~s}$. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

146454 Two black bodies $A$ and $B$ have equal surface areas and are maintained at temperatures $27^{\circ} \mathrm{C}$ and $177^{\circ} \mathrm{C}$ respectively. What will be the ratio of the thermal energy radiated per second by $A$ to that by $B$ ?

146456 A wire has resistance of $3.1 \Omega$ at $30{ }^{\circ} \mathrm{C}$ and 4.5 $\Omega$ at $100{ }^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is

146457 A sphere at $600 \mathrm{~K}$ is losing heat due to radiation. At this temperature its rate of cooling is $R$. The rate of cooling of this sphere at $400 \mathrm{~K}$ is (temperature of surroundings is 200 K)

146458 Two identical shaped metallic spheres $A$ and $B$ made up of same material of mass ' $m$ ' and ' $4 \mathrm{~m}$ ' are heated to attain a temperature $T_{1}$ and then they are placed in a container maintained at temperature $T_{2}\left(T_{2} \lt T_{1}\right)$. The spheres are thermally insulated from each other. If $R$ is the rate of change of temperature, then the ratio $\mathbf{R}_{A} \& \mathbf{R}_{B}$ is

146453 A horizontal fire hose with a nozzle of crosssectional area $\frac{5}{\sqrt{21}} \times 10^{-3} \mathrm{~m}^{2}$ delivers a cubic meter of water in $10 \mathrm{~s}$. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

146454 Two black bodies $A$ and $B$ have equal surface areas and are maintained at temperatures $27^{\circ} \mathrm{C}$ and $177^{\circ} \mathrm{C}$ respectively. What will be the ratio of the thermal energy radiated per second by $A$ to that by $B$ ?

146456 A wire has resistance of $3.1 \Omega$ at $30{ }^{\circ} \mathrm{C}$ and 4.5 $\Omega$ at $100{ }^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is

146457 A sphere at $600 \mathrm{~K}$ is losing heat due to radiation. At this temperature its rate of cooling is $R$. The rate of cooling of this sphere at $400 \mathrm{~K}$ is (temperature of surroundings is 200 K)

146458 Two identical shaped metallic spheres $A$ and $B$ made up of same material of mass ' $m$ ' and ' $4 \mathrm{~m}$ ' are heated to attain a temperature $T_{1}$ and then they are placed in a container maintained at temperature $T_{2}\left(T_{2} \lt T_{1}\right)$. The spheres are thermally insulated from each other. If $R$ is the rate of change of temperature, then the ratio $\mathbf{R}_{A} \& \mathbf{R}_{B}$ is

146453 A horizontal fire hose with a nozzle of crosssectional area $\frac{5}{\sqrt{21}} \times 10^{-3} \mathrm{~m}^{2}$ delivers a cubic meter of water in $10 \mathrm{~s}$. What will be the maximum possible increase in the temperature of water while it hits a rigid wall (neglecting the effect of gravity)?

146454 Two black bodies $A$ and $B$ have equal surface areas and are maintained at temperatures $27^{\circ} \mathrm{C}$ and $177^{\circ} \mathrm{C}$ respectively. What will be the ratio of the thermal energy radiated per second by $A$ to that by $B$ ?

146456 A wire has resistance of $3.1 \Omega$ at $30{ }^{\circ} \mathrm{C}$ and 4.5 $\Omega$ at $100{ }^{\circ} \mathrm{C}$. The temperature coefficient of resistance of the wire is

146457 A sphere at $600 \mathrm{~K}$ is losing heat due to radiation. At this temperature its rate of cooling is $R$. The rate of cooling of this sphere at $400 \mathrm{~K}$ is (temperature of surroundings is 200 K)

146458 Two identical shaped metallic spheres $A$ and $B$ made up of same material of mass ' $m$ ' and ' $4 \mathrm{~m}$ ' are heated to attain a temperature $T_{1}$ and then they are placed in a container maintained at temperature $T_{2}\left(T_{2} \lt T_{1}\right)$. The spheres are thermally insulated from each other. If $R$ is the rate of change of temperature, then the ratio $\mathbf{R}_{A} \& \mathbf{R}_{B}$ is