A dish of hot food has an emissivity of 0.40 and emits 20 w, Ask an Expert

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Q1. To water the yard, you use a hose with a diameter of 3.40 cm. Water flows from the hose with a speed of 1.50 m/s. If you partially block the end of the hose so the effective diameter is now 0.62 cm, with what speed does water spray from the hose?

Q2. A dish of hot food has an emissivity of 0.40 and emits 20 W of thermal radiation. If you wrap it in aluminium foil, which has an emissivity of 0.008, how much power would it radiate?

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