Question

A 6.5 cm thick ice sheet covers a lake in early spring. The ice density is 910 kg/m3.

Part A

If the spring sun radiates an average of 155 W/m2 onto the ice, how much time will it take to melt all the ice?

Express your answer to two significant figures and include the appropriate units.

View Available Hint(s)

Hint 1.

In general, power (P) is energy per unit time.

P=?E?t

Therefore

?t=QP

where Q=mLf   or Q=(?Ad )Lf , and the P=IA .

You should notice that the area (A) drops out of the equation, but the thickness of the ice (d) remains.

t =

Answer 1