Heat Transfer Practice

A metal spoon gets hot in soup mainly by:

Which heat transfer mechanism CANNOT work in the vacuum of space?

Earth is warmed by the Sun primarily through:

A wall conducts 100 W of heat at ΔT = 20 K. What is the rate if ΔT becomes 40 K? (W)

Heat conducted through 1.5 m² of fiberglass (k = 0.04 W/m·K), 0.02 m thick, with ΔT = 30 K: rate in watts?

If an object's absolute temperature doubles, its radiated power:

How much power does a 2 m² black surface at 400 K radiate? (σ = 5.67e-8 W/m²K⁴. Answer in W.)

Warm air rises because it is less dense than the surrounding cool air.

A metal bench at 20 °C is actually colder than a wooden bench at 20 °C.

Why is water such an effective coolant?