6.) Explain why a piece of metal sinks but metal shaped into a boat can float? 7

Question

6.) Explain why a piece of metal sinks but metal shaped into a boat can float? 7.) The density of water at 0 degrees Celsius is greater than that of ice. Why is this important for life on Earth? 8.) If you partially cover the end of a hose with your thumb, the water shoots out further, why? 9.) Explain in terms of energy conservation what happens as water goes through a phase change. How does an ice cube in a glass of iced tea cause its temperature to change? How does sweating keep our bodies cool? Explain why you would put water on fruit when the temperature is dropping 0 degrees Celsius to keep it from freezing? 10.) Why do we cook food in boiling water? How does a pressure cooker speed up cooking times? Why must cooking directions be altered for high altitudes?

Explanation / Answer

6)

for objects in fluid buoyant force acts in upward force

buoyant force = rho_water*Vimmeresed*g

for a given mass ,as the volume is increased the force also increases

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If the metal volume is increased by changing the shape , it can be made to float
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7)

The density of water at 0 degrees Celsius is greater than that of ice.

this is because anamoluos expansion of water

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8)

equation of continuity ,the volume flow rate remains same at all point

A*v = constant

A1*v1 = A2*v2

v2 = (A1*v1)/A2

speed inversely proportional to area

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