Question

HELP ASAP!! DUE TOMORROW!! FAN AND MEDAL!!
HELP WITH 3 & 5 AND CHECK 4, 6, 8, 9, 10

3. Cooking pots are made of metal but often the handle of a cooking pot is made of a type of plastic or rubber. Explain why this design makes sense.

4. A down jacket keeps your body warm mostly by reducing which form of heat transfer?
a. conduction - ANSWER
b. convection
c. thermal radiation

5. What is the advantage of designing a thermos so that it has a vacuum layer surrounding the area where hot liquids are stored?

6. What is the difference between forced and natural convection?
ANSWER - Natural convection is the movement that is powered by gravity, and the fact that warmer fluids and gases change density when they are heated. Forced convection is when the fluid or gas is pumped or blown by an external force.

8. How does heat from the Sun get to Earth?
a. conduction
b. convection
c. thermal radiation - ANSWER

9. Explain the roles of density and temperature in convection.
ANSWER - When the TEMPERATURE of a gas increases, the volume increases too, therefore the DENSITY decreases and the warm gas rises. That's how heat is transferred by CONVECTION.

10. A sailor on a sailboat depends on the process of convection. Explain why this is so.
ANSWER - Trade winds are created from hot air rising and cold air sinking, winds spiral into Lows and out of Highs, and good sailors know how to use whatever wind there is no matter which way it is blowing.

Answer 1

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