9. State whether water at each of the following temperatures will expand or cont

Question

9. State whether water at each of the following temperatures will expand or contract when warmed a little. (a) at 0° C

expand contract    

(b) at 4° C

expand contract    

(c) at 6° C

expand contract    

10. If water had a lower specific heat, would ponds be more likely to freeze or less likely to freeze?

more likely to freeze or less likely to freeze   

11. If cooling occurred at the bottom of a pond instead of at the surface, would a lake freeze from the bottom up?

Yes or No    

12. Would you expect the temperature of water at the bottom of Niagara Falls to be slightly higher than the temperature at the top of the falls?

Yes or No    

13. Suppose you cut a small gap in a metal ring. If you heat the ring, will the gap become wider or narrower?

narrower or wider    

14. After you measure the dimensions of a plot of land with a steel tape on a hot day, you come back and re-measure on a cold day. On which day do you determine the larger area for the land?

You measure a larger area on a cold day. The temperature will make no difference in your measurement.     You measure a larger area on a hot day.

15. Will a grandfather pendulum clock run faster or slower on a hot day?

The clock will be unaffected by temperature. The clock will run faster.     The clock will run slower.

16. What would be the final temperature of a mixture of 50 g of 40° C water and 50 g of 50° C water?
° C

Explanation / Answer

9)

In at 00c and 40c water contracts and at 60 c it expands

00 to 40c contracts because of anomoulus expansion

10)

Lower is the specific heat of a substnace more is its tendency to lose heat and gets freezed.

Hence,

Ponds likely to freeze in less time becuase they could not hold on the heat as well.

16)

Since its all water, and there is 50 grams of water at eachinitial temp, the final temp is right in the middle of 40 and 50

final temp is 30 deg C

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