Physics 101

Homework #7.25

1) The moderate temperatures of islands throughout the world has much to do withwater's

            a)  poor conductivity    b)  vast supply of potential energy

            c)  high heat capacity    d)  high evaporation rate

2) If glass expanded more than mercury, then the column of mercury in a thermometer would rise when

            a)  the temperature increased    b)  the temperature decreased        c)  neither of these

3) If the specific heat of water were lower than it is, ponds in the cold of winterwould be

            a)  more likely to freeze        b)  less likely to freeze    c)  neither, would have no effect

4) When water at 4^oC is heated, it expands.When water at 4^oCis cooled it

            a)  contracts        b)  expands        c)  neither contracts nor expands

5) Metals are both good heat conductors and electrical conductors because of the

            a)  similarity between thermal and electrical conductive properties

            b)  looseness of outer electrons in metal atoms

            c)  relatively high density of metals

            d)  high elasticity of metals

6)        An object will normally be a net radiator of energy when its temperature is

            a)  higher than its surroundings

            b)  lower than its surroundings

            c)  neither of these

7) Your feet feel colder on a tile floor than on a rug because the tile floor

a)  is usually warmer than the rug

            b)  is a better conductor than the rug

            c)  has more internal energy than the rug

d)  all of these

8) To say that evaporation is a cooling process is to say that the

            a)  remaining liquid left behind is cooler        b)  surrounding air is cooler

9) When liquids change to a solid state, they

            a)  absorb energy        b)  release energy        c)  neither

10) Increased air pressure on the surface of hot water tends to

            a)  prevent boiling        b)  promote boiling        c)  neither