When a cold drink is taken from a refrigerator, its temperature is 5°c. after 25 minutes in a 20°c room its temperature has increased to 10°c. (round your answers to two decimal places.) (a) what is the temperature of the drink after 45 minutes? °c (b) when will its temperature be 16°c? min

a)T=12.77°C

b) t=83.38 min

Explanation:

=5°C

After 25 min, T=10°C  

Air temperature =20°C

We know that cold drink will cool because its surrounding temperature is high .

From Newton's law of cooling

Where K is the constant,T is the temperature at any time t and is the surrounding temperature.

By solving above differential equation

When t=25 min T=10°C

(a) When t=45 min

T=12.77°C

(b) When T=16°C

t=83.38 min

d) physical means can be used to separate the components of air.

a.   mass number from atomic number