I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm².If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L_f = 80 cal/g)
A) 9.6 × 10−⁵

I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm<sup>2</sup>.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (L<sub>f</sub> = 80 cal/g) A) 9.6 × 10−<sup>5</sup> B) 2.8 × 10−<sup>6</sup> C) 1.15 × 10−<sup>2</sup> D) 2.3 × 10−<sup>4</sup>

B) 2.8 × 10−⁶
I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (Lf = 80 cal/g) A) 9.6 × 10−5 B) 2.8 × 10−6 C) 1.15 × 10−2 D) 2.3 × 10−4

C) 1.15 × 10−²
I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (Lf = 80 cal/g) A) 9.6 × 10−5 B) 2.8 × 10−6 C) 1.15 × 10−2 D) 2.3 × 10−4

D) 2.3 × 10−⁴
I place a 250-g ice cube (initially at 0°C)in a Styrofoam box with wall thickness 1.0 cm and total surface area 600 cm2.If the air surrounding the box is at 20°C and after 2 hours the ice is completely melted,what is the conductivity of the Styrofoam material? (Lf = 80 cal/g) A) 9.6 × 10−5 B) 2.8 × 10−6 C) 1.15 × 10−2 D) 2.3 × 10−4

Two Stars,A and B,have the Same Emissivity,but the Radii and Surface

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