Conceptual Physics- Universal Dwelling Unit Test Flashcards

1
Q

What is the formula for area (of a floor plan/living space).

A

length (feet or meters) x width (feet or meters) = area (square feet or square meters)

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2
Q

Give the total living space of a house that is 24x38 feet. Show work

A
24x38= 912 ft2
600+160+120+32= 912 ft2
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3
Q

What does a heating and cooling curve look like?

A

a bell shape or a upside-down hyperbola

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4
Q

Larger windows transfer blank heat

A

more

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5
Q

How much heat does a 5x7 window transfer compared to a 2x3 window?

A

5x7 35 5.8333333333…
—— = —- = ———————
2x3 6 1
The 5x7 window transfers 5.83333…. times as much as the 2x3 window

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6
Q

How does insulaton affect how heat is transferred

A

CD: air spaces- air is a bad conductor because it is a gas
CV: air spaces are too small for convection currents
Radiation: shiny or light colored surfaces reflect heat transferred by radiation.

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7
Q

How do you find combined R-Values

A

addition

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8
Q

Explain how you could reach R-35 using: R-10; R-5; R-7; and R-15? List 4 methods

A
Three layers of ten, layer of five
two layers of fifteen, layer of five
seven layers of five
five layers of seven
two layers of ten, layer of fifteen
layer of fifteen, layer of ten, two layers of five

etc. anything that adds up to 35

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9
Q

How does heat enter leave or travel through a building?

A

CD: transfers heat through walls by direct contact of atoms
CV: circulates heat in house- hot air rises
R: transfers heat to outside and roof of building or through windows

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10
Q

Why does hot air rise? (mention Density)

A

Hot air is less dense than cold air. Liquids and GASES layer by density with densest objects at bottom (in this case cooler air).

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11
Q

What is the density formula? Provide units

A

grams/centimeters^3

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12
Q

Calculate density of cube: 6x2x9; weighs 40 grams

A
6x2x9= 108 (12x9 (18+90))
108/40= 2.7g/cm^3
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13
Q

What is heat?

A

heat is the total kinetic energy in molecules

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14
Q

What is temperature?

A

measurement of average kinetic energy (how fast they are moving/speed)

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15
Q

Give two examples of conduction:

A

hand on a hot pan, molecules in a hot wall touching each other, pan being heated by stove (touching the stove)

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16
Q

Give two examples of convection:

A

wind, radiator, hot air in house,

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17
Q

Give two examples of radiation:

A

fire heating room, sun hitting the house

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18
Q

Two examples of Conductors:

A

metal; glass; solids in general

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19
Q

Two examples of insulators:

A

styrofoam (with air pockets); down; gases or pockets of gases within solids in general

20
Q

Two materials that reflect heat.

A

aluminum, paper, white shirt

21
Q

two materials that absorb heat:

A

dull/dark cloth; leather (not white); asphalt; black desk;

22
Q

What is thermal equilibrium?

A

when two liquids/solids/gases of differing temperatures are in contact with each other, they with gradually become the same temp.

23
Q

What direction does heat go?

A

from warmer to colder; except radiation, which goes in all directions

24
Q

If it is: 38 degrees outside; 63 inside a gym; and a cool water bottle inside the gym is 47; then where will the heat go?

A

from the gym to the outside and the bottle.

25
Q

How do liquids and gases layer?

A

from densest (at the bottom) to least dense

26
Q

If something1 is 1.3 g/cm3, something2 is 3.2, and something3 is .3, how will they layer from top to bottom?

A

something3
something1
something2

27
Q

What is the law of conservation of energy?

A

energy cannot be destroyed or created; it can only change form

28
Q

Why does an iceberg have more heat than a pot of boiling water?

A

More molecules-more heat energy. Even though the temperature is less, there is more overall movement (kinetic energy) because there are so many molecules

29
Q

potential energy

A

stored energy (stretched rubber band)

30
Q

thermal energy

A

heat energy (fire/burning)

31
Q

kinetic energy

A

energy of movement (released rubber band flying through air)

32
Q

energy

A

the force that makes matter move or change; or the ability to make something move or go; many types

33
Q

km

A

kilometer

34
Q

of meters in a km

A

1000

35
Q

cm

A

centimeter

36
Q

of cm in a meter

A

100

37
Q

mm

A

millimeter

38
Q

how many mm in a meter?

A

1000

39
Q

how many mm in a cm?

A

10

40
Q

conduction:

A

heat transfer through direct contact of molecules

41
Q

conductor

A

substance that allows heat to transfer easily

42
Q

convection

A

heat transfer in groups of molecules; caused by differences in density; groups of molecules rise and fall due to density

43
Q

radiation

A

heat transfer by electromagnetic waves

44
Q

density

A

amount of matter in a unit of space; mass divided by volume; how compact something is

45
Q

insulator

A

restricts heat transfer; a material that does not allow heat to transfer easily through it