149317 A uniform copper rod of $50 \mathrm{~cm}$ length is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water $1 \mathrm{~mm}$ thick at each end, the temperature gradient (in ${ }^{\circ} \mathrm{C} \mathrm{m}^{-1}$ ) in the bar is (assume that the thermal conductivity of copper is $400 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and water is $0.4 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ )
149318 A partition wall has two layers of different materials $A$ and $B$ in contact with each other. They have the same thickness but the thermal conductivity of layer $A$ is twice that of layer $B$. At steady state if the temperature difference across the layer $B$ is $50 \mathrm{~K}$, then the corresponding difference across the layer $A$ is
149320 An ice box made of Styrofoam (Thermal conductivity $=0.01 \mathrm{Jm}^{-1} \mathrm{~s}^{-1} \mathrm{~K}^{-1}$ ) is used to keep liquids cool. It has a total wall area including lid of $0.8 \mathrm{~m}^{2}$ and wall thickness of $2.0 \mathrm{~cm}$. A bottle of water is placed in the box and filled with ice. If the outside temperature is $30^{\circ} \mathrm{C}$ the rate of flow of heat into the box is: (in $\mathrm{J}^{-1}$ ) :
149317 A uniform copper rod of $50 \mathrm{~cm}$ length is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water $1 \mathrm{~mm}$ thick at each end, the temperature gradient (in ${ }^{\circ} \mathrm{C} \mathrm{m}^{-1}$ ) in the bar is (assume that the thermal conductivity of copper is $400 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and water is $0.4 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ )
149318 A partition wall has two layers of different materials $A$ and $B$ in contact with each other. They have the same thickness but the thermal conductivity of layer $A$ is twice that of layer $B$. At steady state if the temperature difference across the layer $B$ is $50 \mathrm{~K}$, then the corresponding difference across the layer $A$ is
149320 An ice box made of Styrofoam (Thermal conductivity $=0.01 \mathrm{Jm}^{-1} \mathrm{~s}^{-1} \mathrm{~K}^{-1}$ ) is used to keep liquids cool. It has a total wall area including lid of $0.8 \mathrm{~m}^{2}$ and wall thickness of $2.0 \mathrm{~cm}$. A bottle of water is placed in the box and filled with ice. If the outside temperature is $30^{\circ} \mathrm{C}$ the rate of flow of heat into the box is: (in $\mathrm{J}^{-1}$ ) :
149317 A uniform copper rod of $50 \mathrm{~cm}$ length is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water $1 \mathrm{~mm}$ thick at each end, the temperature gradient (in ${ }^{\circ} \mathrm{C} \mathrm{m}^{-1}$ ) in the bar is (assume that the thermal conductivity of copper is $400 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and water is $0.4 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ )
149318 A partition wall has two layers of different materials $A$ and $B$ in contact with each other. They have the same thickness but the thermal conductivity of layer $A$ is twice that of layer $B$. At steady state if the temperature difference across the layer $B$ is $50 \mathrm{~K}$, then the corresponding difference across the layer $A$ is
149320 An ice box made of Styrofoam (Thermal conductivity $=0.01 \mathrm{Jm}^{-1} \mathrm{~s}^{-1} \mathrm{~K}^{-1}$ ) is used to keep liquids cool. It has a total wall area including lid of $0.8 \mathrm{~m}^{2}$ and wall thickness of $2.0 \mathrm{~cm}$. A bottle of water is placed in the box and filled with ice. If the outside temperature is $30^{\circ} \mathrm{C}$ the rate of flow of heat into the box is: (in $\mathrm{J}^{-1}$ ) :
149317 A uniform copper rod of $50 \mathrm{~cm}$ length is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water $1 \mathrm{~mm}$ thick at each end, the temperature gradient (in ${ }^{\circ} \mathrm{C} \mathrm{m}^{-1}$ ) in the bar is (assume that the thermal conductivity of copper is $400 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and water is $0.4 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ )
149318 A partition wall has two layers of different materials $A$ and $B$ in contact with each other. They have the same thickness but the thermal conductivity of layer $A$ is twice that of layer $B$. At steady state if the temperature difference across the layer $B$ is $50 \mathrm{~K}$, then the corresponding difference across the layer $A$ is
149320 An ice box made of Styrofoam (Thermal conductivity $=0.01 \mathrm{Jm}^{-1} \mathrm{~s}^{-1} \mathrm{~K}^{-1}$ ) is used to keep liquids cool. It has a total wall area including lid of $0.8 \mathrm{~m}^{2}$ and wall thickness of $2.0 \mathrm{~cm}$. A bottle of water is placed in the box and filled with ice. If the outside temperature is $30^{\circ} \mathrm{C}$ the rate of flow of heat into the box is: (in $\mathrm{J}^{-1}$ ) :
149317 A uniform copper rod of $50 \mathrm{~cm}$ length is insulated on the sides and has its ends exposed to ice and steam respectively. If there is a layer of water $1 \mathrm{~mm}$ thick at each end, the temperature gradient (in ${ }^{\circ} \mathrm{C} \mathrm{m}^{-1}$ ) in the bar is (assume that the thermal conductivity of copper is $400 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ and water is $0.4 \mathrm{Wm}^{-1} \mathrm{~K}^{-1}$ )
149318 A partition wall has two layers of different materials $A$ and $B$ in contact with each other. They have the same thickness but the thermal conductivity of layer $A$ is twice that of layer $B$. At steady state if the temperature difference across the layer $B$ is $50 \mathrm{~K}$, then the corresponding difference across the layer $A$ is
149320 An ice box made of Styrofoam (Thermal conductivity $=0.01 \mathrm{Jm}^{-1} \mathrm{~s}^{-1} \mathrm{~K}^{-1}$ ) is used to keep liquids cool. It has a total wall area including lid of $0.8 \mathrm{~m}^{2}$ and wall thickness of $2.0 \mathrm{~cm}$. A bottle of water is placed in the box and filled with ice. If the outside temperature is $30^{\circ} \mathrm{C}$ the rate of flow of heat into the box is: (in $\mathrm{J}^{-1}$ ) :