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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What does a heating and cooling curve look like?

A

a bell shape or a upside-down hyperbola

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Larger windows transfer blank heat

A

more

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How do you find combined R-Values

A

addition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the density formula? Provide units

A

grams/centimeters^3

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Calculate density of cube: 6x2x9; weighs 40 grams

A
6x2x9= 108 (12x9 (18+90))
108/40= 2.7g/cm^3
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is heat?

A

heat is the total kinetic energy in molecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is temperature?

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Give two examples of convection:

A

wind, radiator, hot air in house,

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Give two examples of radiation:

A

fire heating room, sun hitting the house

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Two examples of Conductors:

A

metal; glass; solids in general

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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
How do liquids and gases layer?
from densest (at the bottom) to least dense
26
If something1 is 1.3 g/cm3, something2 is 3.2, and something3 is .3, how will they layer from top to bottom?
something3 something1 something2
27
What is the law of conservation of energy?
energy cannot be destroyed or created; it can only change form
28
Why does an iceberg have more heat than a pot of boiling water?
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
potential energy
stored energy (stretched rubber band)
30
thermal energy
heat energy (fire/burning)
31
kinetic energy
energy of movement (released rubber band flying through air)
32
energy
the force that makes matter move or change; or the ability to make something move or go; many types
33
km
kilometer
34
of meters in a km
1000
35
cm
centimeter
36
of cm in a meter
100
37
mm
millimeter
38
how many mm in a meter?
1000
39
how many mm in a cm?
10
40
conduction:
heat transfer through direct contact of molecules
41
conductor
substance that allows heat to transfer easily
42
convection
heat transfer in groups of molecules; caused by differences in density; groups of molecules rise and fall due to density
43
radiation
heat transfer by electromagnetic waves
44
density
amount of matter in a unit of space; mass divided by volume; how compact something is
45
insulator
restricts heat transfer; a material that does not allow heat to transfer easily through it