please help! thanks in advance Suppose city 1 leaves an entire block (100 m × 10

Question

please help! thanks in advance

Suppose city 1 leaves an entire block (100 m × 100 m) as a park with trees and grass (emissivity 0.96) while city 2 paves the same area over with asphalt (emissivity 1.0). Sunlight heats each surface to 42.0 C by sunset, and then the surface radiates its heat into a cube of air 100 m on a side and at 30.0 C.

Problem 16.8 rk in city ergy to the air Expres to three sig ant ngure nd include appropriate units. Value Units Submit M Incorrect Try Again; 5 attempts remaining te does the asph in city 2 deliver to the Expres to three sig ant figures nd inalude appropriate units. Value Units Submit My Answers Gis ch city block maintain same radiat-d pow-r for h and th-e. no other .no-ray b.....whati, th- final P-xture of the cub- of in bove the blacks in city 1? The den ty of »ir at 30.0 C iv e kg/m Expres to three sig ant figures lude appropriate units. Value Units Submit My Answers Gies up block maintains the Kame radiated power for 1.6 h and there are no other energy bove the blacks in city 2? The density of 30.0 C e kg/m ch city temp-rxture of the cube Expres to three sig ant figure nd inolude appropriate units. Value Units Submit My Answers Gis up 30.0 C

Explanation / Answer

Part A )

E = e A ( T24 - T14 )

= 0.96 X 5.67 X 10-8 X 100 X 100 X ( 3154 - 3034 )

E = 771142.57 W

Part B )

E = A ( T24 - T14 )

= 5.67 X 10-8 X 100 X 100 X ( 3154 - 3034 )

E = 803273.51 W

Part C )

771142.57 X 1.8 X 3600 = 1003 X 1.16 X 1008 X ( T - 30 )

T - 30 = 4.27

T = 34.27oC

Part D )

803273.51 X 1.8 X 3600 = 1003 X 1.16 X 1008 X ( T - 30 )

T - 30 - 4.45 = 0

T = 34.45oC

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