ATSC 110 Test 1 Questions with All Correct Answers
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Course
ATSC 110
Institution
ATSC 110
ATSC 110 Test 1 Questions with All Correct Answers
What is kinetic energy? - Answer- Anybody in motion has kinetic energy, therefore kinetic energy is the energy within a body that is a result of its motion.
How does the average speed of air molecules relate to the air temperature? - Answer-...
ATSC 110 Test 1 Questions with All
Correct Answers
What is kinetic energy? - Answer- Anybody in motion has kinetic energy, therefore
kinetic energy is the energy within a body that is a result of its motion.
How does the average speed of air molecules relate to the air temperature? - Answer-
Temperature is a measure of the average speed of the atoms and molecules, where
higher temperatures correspond to faster average speeds of atoms and molecules.
Distinguish between temperature and heat. - Answer- Temperature is a measure of
molecular motion; Heat is energy in the process of being transferred from one object to
another because of the temperature difference between them.
If it is winter and January in New York City, what is the season in Sydney, Australia? -
Answer- Since Sydney, Australia (33½˚ S Lat) is in the Southern Hemisphere, it would
be summer but the month of the year is still January.
At the same pressure, why is cold air more dense than warm air? - Answer- Air
temperature is a measure of the average speed of the molecules. In the cold volume of
air, the molecules move more slowly and crowd closer together. In the warm volume,
they move faster and farther apart. Since the molecules are closer together in the cold
volume, the density is greater.
Name and describe the three different temperature scales. - Answer- Kelvin scale →
starting point is absolute zero (0K), freezing point (273K) and boiling point (373K) at sea
level. The Kelvin scale contains no negative numbers and is therefore quite convenient
for scientific calculations.
Celsius scale → The number 0 (zero) is assigned to the temperature at which pure
water freezes and 100 to the temperature at which pure water boils at sea level. (100
divisions between the two)
Fahrenheit scale → The number 32 is assigned to the temperature at which pure water
freezes and 212 to the temperature at which pure water boils at sea level. (180 divisions
between the two)
What is the difference between the 'heat capacity' and 'specific heat' of an object?
What are the "specific heat values" for water, ice and the earth surface? - Answer- The
heat capacity of a substance is the ratio of the amount of heat energy absorbed by that
substance to its corresponding temperature rise. The heat capacity of a substance per
, unit mass is called specific heat. In other words, specific heat is the amount of heat
(calories) needed to raise the temperature of one gram of substance one degree
Celsius.
Specific Heat Values:
Water → 1.0 cal/gram ˚C
Ice → 0.5 cal/gram ˚C
Earth surface (land) → 0.3 cal/gram ˚C
How will the heating rate of objects with a high specific heat value compare with objects
with a lower specific heat value? - Answer- Since 'specific heat' is defined as the
amount of energy needed to raise the temperature of 1 gram of substance 1 degree
Celsius, the substances with the higher specific heat values will warm and cool slower
than substances with smaller specific heat values. In other words water at a specific
value of 1 cal/gram ˚C will warm and cool slower than land at a specific heat value of
0.3 cal/gram ˚C
Define 'Latent Heat'.
Define 'Sensible Heat'. - Answer- Latent heat is the heat energy required to change a
substance, such as water, from one state, or phase, to another.
Sensible heat is the heat we can feel, 'sense', and measure with a thermometer.
Name the phase change processes for water and the amount of energy need to do
each process. You will need to look this answer up in the book or lecture notes since
the question is fairly detailed and important to understand. The answer to this question
is one that you will want to memorize. - Answer- Condensation +600cal/gr
Evaporation - 600cal/gr
Freezing +80cal/gr
Melting - 80cal/gr
Deposition (vapor → ice) +680cal/gr
Sublimation (ice → vapor) - 680cal/gr
+ heat energy added to the environment
- heat energy taken from the environment
Explain how "latent heat" plays an important role as a source of atmospheric energy? -
Answer- When water vapor changes to a liquid or ice cloud particle, a tremendous
amount of heat energy is released into the environment due to the release of latent heat
during the phase change. This heat provides energy for storms, such as hurricanes,
mid-latitude cyclones, and thunderstorms.
How many total calories are required to raise the temperature of a 40 gram block of ice
from -20°C to 0°C, melt the 40 gram block of ice, and then raise the temperature of the
melt water from 0°C to 10°C? - Answer- 1. Raise temp of ice 20°C.
40gr X 20°C X 0.5cal/gr°C = 400 cal
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