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Physics Test Answers TEMPERATURE AND HEAT
Terms in this set (40)
The temperature of a sample of a substance is a way to gauge
the average kinetic energy of the molecules in that sample
After I dip a cup of water from the ocean (assuming there is no heat loss from the water to the cup and you take the temperature immediately after you take your sample), I can conclude that
the temperature of the water in the cup is the same as the temperature of the water in the ocean
Heat is a form of energy, and it has long been known that heat energy will naturally flow
from hot to cold objects
The amount of heat is often measured in calories. If I add 1 calorie of heat energy to 1 gram of water, the temperature of the water will
increase by 1 degree C
On a cold winter's morning you awake and step out of bed. One foot is on the tile floor and the other is on a rug on the floor. Which statement is true?
The tile feels colder because it conducts heat more rapidly away from your foot
Two identical objects, one light colored and the other dark colored, are at the same elevated temperature, 50 degrees C. You now place them in a dark, much cooler room. Which object will reach the room's temperature first?
Both reach room temperature at the same time
Two identical objects, one light colored and the other dark colored, are at the same cool temperature. Then, you place them outside, on a warm day, in direct sunlight. Which object will warm up faster?
The dark one
The lowest possible temperature a body an approach is called
Water freezes at 273 degrees on the _____________ scale
When the temperature of the air in a balloon is raised, the volume of the balloon
Objects A and B are at the same temperature. Object A now has its temperature increased by one Fahrenheit degree, while B has its temperature increased by on e Kelvin degree. Which object now has a higher temperature?
Which process does not transfer heat energy between objects?
A mixture consists of 70g of ice and 60g of liquid water, both at 0 degrees C. (The latent heat of fusion of water is 80 cal/g and the specific heat capacity of water is 1.0 cal/g C.) The amount of heat that must be added to melt all of the ice is about
While studying for this quiz you realize that you still have 100g of lukewarm coffee at 40 degrees C left in a paper cup. When you pour 20g of boiling water into the cup, the temperature of the resulting coffee-like mixture will now be
50 degrees C
A box of graham crackers is labeled "120 Calories per serving." Assuming this means 120 kcal, and recalling that 4.16 J = 1 cal, the energy of a serving of graham crackers is about
5 x 10^5 J
The temperature of 100g of water is raised from 10 degrees C to 90 degrees C. The energy needed to do this is about
8 X 10^3 cal
Which of the following temperatures is the lowest?
0 degrees F
Four samples of steel, lead, alcohol, and glass all have the same mass and are all initially at 20 degrees C. After 100 calories of heat are added to each sample, the final temperatures are 38.2 degrees C for the steel, 85.6 degrees C for the lead, 23.4 degrees C for the alcohol, and 30 degrees C for the glass. Which of these four materials has the largest specific heat capacity?
Absolute zero is the temperature
at which an ideal gas would exert zero pressure
On a cold day, a metal fence post feels colder to the touch than a tree. This sensation of different temperatures is explained by the fact that
the thermal conductivity of the metal is higher
The term heat in physics is
energy transferred to a body because of a difference in temperature
During the course of a demonstration the professor is called away. When he returns he finds a beaker of water that was at room temperature is now at a slightly higher temperature. There is a stirring rod on the desk and a cigarette lighter. The professor can assume that the temperature increase is due to
either head added or mechanical work done
Heat flows into a gas in a piston and the gas performs some work on its surroundings. The amount of work done is less than the heat added. In this situation,
the internal energy of gas increased
Compare the internal energy of one gram of steam to that of one gram of water if both are at 100 degrees C
the internal energy of the steam will be higher
An ice cube of mass 100g and at 0 degrees C is dropped into a styrofoam cup containing 200g of water at 25 degrees C. (The latent head of fusion of water is 80 cal/g and the specific heat capacity of water is 1.0 cal/g C.) Assuming the cup does not exchange any heat with the outside, what will happen?
some of the ice will melt
Heat is added to an ideal gas and the gas expands. In such a process the temperature
will remain the same if work done equals the heat added
Hot cider is poured into a metal cup. Shortly thereafter the handle of the cup becomes hot. This is due to the process of
A physics student has to make a choice in the color of paint to put on her geosynchronous communication satellite, MYSAT1. Considering most of its orbit is in sunlight, the decision of a light versus dark color paint will depend on which concept below
A light paint would be better for keeping the satellite cool in sunlight
The temperature of a 50g sample of aluminum is raised from 20 degrees C to 60 degrees C when 440 cal of heat is added. The specific heat capacity of the aluminum is
.22 cal/g C
If you stand near a large fire, your face will be cooler if you place your hand between your face and the fire. Your hand is preventing heat flow by
Whenever gas is compressed
work must be done on the gas
After working hard outside on a hot summer day, placing a towel soaked in cold water on your head can feel very good. The reason the towel feels cold to you is that
heat conducts from your head to the towel, lowering your temperature
You lose your left sandal during a hot afternoon at the beach. Thus, you must hike back to your vehicle with one bare foot across the burning sand. Why does the bare foot get so much hotter?
The sandal insulates the right foot from the hot sand
Which object is hotter?
object 1 at T = 0 degrees C
The air at the beach is the same temperature everywhere, but you feel cooler under a beach umbrella because
solar radiation is not heating up your skin
When you apply an alcohol swab to your skin, it feels cool because
your skin transfers a bit of heat to the liquid alcohol and the alcohol evaporates
An ice cube is floating in a glass of water with the water level just reaching the top of the glass. If the temperature in the surrounding area is above freezing, the ice cube will melt. When it does
the water level in the glass will remain unchanged as the ice continues to melt
Water in a dish is set on a table in an initially empty closed room and begins to evaporate. The temperature in the room will
begin to increase
During a phase change the temperature of the system will be ________ as heat is added
Heat will not be transferred between two bodies that are the same
THIS SET IS OFTEN IN FOLDERS WITH...
Chapter 12: Electrostatics
Chapter 8 - Rotational Motion of Solid Objects
Energy and Oscillations
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