Need some help please show step by step On a 80 degree C mor

On a -8.0 degree C morning, you find ice 1.8 mm thick on your car\'s rear window. If the window is 1.2 m wide and 0.55 m high, at what rate must the window heater supply energy to melt all the ice in 5 min ? Express your answer to two significant figures and include the appropriate units.

Solution

Wind shield area = 1.2 x 0.55 = 0.66 m²

Thickness of ice = 1.8 mm = 0.0018 m

Volume of ice = 0.66 x 0.0018 = 0.001188 m³

Mass of ice

m = density of ice x volume of ice

m = 919 x (0.001188)

m = 1.09 kg

Now, amount of energy required to melt the ice

Q = m x c_p x deltaT

C_p = 2.1 x 10^3

Q = 1.09 x 2.1 x 10^3 x (0-(-8)

Q = 18341 J

Rate at which power is required P = Q/time = 18341/(5 x 60)

P = 61 J