149641 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149642 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149643 A liquid cools down from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 5 min. The time taken to cool it form $60^{\circ} \mathrm{C}$ to $5^{\circ} \mathrm{C}$ will be

149646 A body cools from $70^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$. Calculate the time it takes to cool from $60^{\circ} \mathrm{C}$ to $30^{\circ} \mathrm{C}$. The temperature of the surroundings is $\mathbf{2 0}^{\circ} \mathrm{C}$.

149641 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149642 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149643 A liquid cools down from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 5 min. The time taken to cool it form $60^{\circ} \mathrm{C}$ to $5^{\circ} \mathrm{C}$ will be

149646 A body cools from $70^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$. Calculate the time it takes to cool from $60^{\circ} \mathrm{C}$ to $30^{\circ} \mathrm{C}$. The temperature of the surroundings is $\mathbf{2 0}^{\circ} \mathrm{C}$.

149641 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149642 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149643 A liquid cools down from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 5 min. The time taken to cool it form $60^{\circ} \mathrm{C}$ to $5^{\circ} \mathrm{C}$ will be

149646 A body cools from $70^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$. Calculate the time it takes to cool from $60^{\circ} \mathrm{C}$ to $30^{\circ} \mathrm{C}$. The temperature of the surroundings is $\mathbf{2 0}^{\circ} \mathrm{C}$.

149641 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149642 A body initially at $80^{\circ} \mathrm{C}$ cools to $64^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$ and to $52^{\circ} \mathrm{C}$ in $10 \mathrm{~min}$. The temperature of the surrounding is
227. A block of metal is heated to a temperature much higher than the room temperature and placed in an evacuated cavity. The curve which correctly represents the rate of cooling ( $T$ is temperature of the block and $t$ is the time.)

149643 A liquid cools down from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ in 5 min. The time taken to cool it form $60^{\circ} \mathrm{C}$ to $5^{\circ} \mathrm{C}$ will be

149646 A body cools from $70^{\circ} \mathrm{C}$ to $40^{\circ} \mathrm{C}$ in $5 \mathrm{~min}$. Calculate the time it takes to cool from $60^{\circ} \mathrm{C}$ to $30^{\circ} \mathrm{C}$. The temperature of the surroundings is $\mathbf{2 0}^{\circ} \mathrm{C}$.