Apond is frozen over with a layer of ice 1.4 cm thick. the water under the ice is at 0∘c. the temperature of the air above the ice is −15∘c. this difference in temperature causes heat to flow through the ice from the water below to the air above. as heat is removed from the water, it freezes, adding to the thickness of the layer of ice. at what rate does the thickness of the ice layer increase? give the answer in centimeters per hour. you only need to consider the freezing of the water. you may neglect any additional cooling of the ice to temperatures below 0∘c.

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

you get 2.3=1.21*\frac{a}2 or 4.6=1.21a or a=3.802 (b)

explanation: