Assignment 9: Temperature and Heat || with A+ Guaranteed Solutions.
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9: Temperature And Heat || With A+ Guar
What are the temperatures for freezing water on the Celsius and Fahrenheit scales? For boiling water? correct answers Freezing: 0°C, 32°F; boiling: 100°C, 212°F
What are the temperatures for freezing water and boiling water on the Kelvin temperature scale? correct answers 273 K, 373 K
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Assignment 9: Temperature and Heat || with A+ Guaranteed
Solutions.
What are the temperatures for freezing water on the Celsius and Fahrenheit scales? For boiling
water? correct answers Freezing: 0°C, 32°F; boiling: 100°C, 212°F
What are the temperatures for freezing water and boiling water on the Kelvin temperature scale?
correct answers 273 K, 373 K
What is meant when we say that a thermometer is in thermal equilibrium with another object?
correct answers Heat no longer flows between the object and thermometer when both are at the
same temperature.
Which one of these cites the lowest temperature? correct answers 270 K
Is there a distinction between thermal energy and internal energy? Which term do physicists
prefer? correct answers Thermal energy emphasizes heat flow, whereas internal energy is the
grand total of all energies inside a substance. Physicists prefer internal energy.
In which direction does heat flow spontaneously between hot and cold objects? correct answers
From high temperature to low temperature
How is heat similar to and different from internal energy? correct answers They are both forms
of energy, but heat flows, whereas internal energy does not.
How is the energy value of foods determined? correct answers The food is burned and the energy
released is measured.
At what temperature do the combined effects of contraction and expansion produce the smallest
volume for water? correct answers 4°C
When we speak about heat we refer to ___________. correct answers energy in transit
Which one of these is largest amount of energy? correct answers 1 Calorie
Suppose that we replace the aluminum with a mystery metal and repeat the experiment in the
video. As in the video, the mass of the metal is the same as that of the water. Room temperature
is about 20∘C before the start of the experiment. The water heats up to 40∘C, and the mystery
metal heats up to 80∘C. Compared to that of water, the heat capacity of our mystery metal is
correct answers one-third as great.
Given the same input of energy, the temperature of the metal increased three times as much as
the temperature of the water. Therefore, the metal has one-third the heat capacity of water.
(Recall that the heat Q delivered to a substance can be written Q = mc ΔT, where m is the mass
of the substance and c is its heat capacity.)
, Does a substance that cools off quickly have a high or a low specific heat capacity? correct
answers A low specific heat capacity
Which of these has the highest specific heat capacity? correct answers Water
Distinguish between a calorie and a joule. correct answers 1 calorie = 4.19 joules
Which of the following changes would make the water balloon more likely to pop? (Ignore
effects of convection within the fluid.) correct answers Use a liquid that has a lower heat
capacity than water.
Use a thicker balloon
Using a liquid with a lower heat capacity than water means that the candle flame will raise the
liquid's temperature more quickly than for water. A thicker balloon will conduct heat through to
the liquid more slowly, so that the outer part of the balloon wall will heat up more quickly to its
melting point.
According to the law of conservation of energy, if ocean water cools, then something else should
warm. What is it that warms? correct answers The cooling ocean warms the air.
Why is the temperature fairly constant for landmasses surrounded by large bodies of water?
correct answers Water has a high specific heat capacity.
Water is most dense at ___________. correct answers 4°C
What kind of strip is Dr. Hewitt holding in his hand? correct answers a strip consisting of brass
on one side and steel on the other, welded together
This is called a bimetallic strip
What happens when Dr. Hewitt heats up the strip? correct answers It bends
Why does the strip behave as it does when Dr. Hewitt heats it up? correct answers Both metals
expand unequally.
Why do substances expand when their temperature is increased? correct answers Higher-
temperature substances have greater molecular motion.
When the temperature of ice-cold water is increased slightly, does it undergo a net expansion or
a net contraction? correct answers Contraction
Why is ice less dense than water? correct answers Ice crystallizes with an open structure, and the
gaps that form between the water molecules in ice increase its volume.
What happens to the amount of "microscopic slush" in cold water when its temperature is
increased? correct answers The amount of microscopic slush decreases as the temperature
increases.
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