The metal sphere cools at 1 °C/min, when its temperature is 50 °C. If the temperature of environment is 30 °C, its rate of cooling at 35 °C is
A. 0.25 °C/min
B. 0.5 °C/min
C. 0.75 °C/min
D. 0.4 °C/min
Answer:A
The metal sphere cools at 1 °C/min, when its temperature is 50 °C. If the temperature of environment is 30 °C, its rate of cooling at 35 °C is
A. 0.25 °C/min B. 0.5 °C/min C. 0.75 °C/min D. 0.4 °C/min