mnsr 22

Question 1

the property of an object that determines the direction of flow of heat energy when brought into thermal contact w an object is called

Answer 1

temperature
( heat moves from high to low temp )

Question 2

rankine scale is

Answer 2

fehrenhite of K
( R= f + 459.67)

Question 3

at constant pressure, volume is directly proportional too the temp

Answer 3

Charles law ( in enclosed volume of gas )

Question 4

all thermometers use

Answer 4

thermometric properties: physical property of a substance that change in uniform but not neccersly in linear rs, and predictable manner as t changes.
Example: color, volume, electrical resistance aka voltage, pressure

Question 5

Oral cavity is

Answer 5

0.4 lower than core t

Question 6

axilla aka armpit is

Answer 6

0.9 lower than core t

Question 7

rectum is

Answer 7

0.3 higher than core

Question 8

factors affecting body temp

Answer 8

time of the day, age, smoking, hormones, hot n cold drinks

Question 9

to change the temp we need to

Answer 9

add or remove heat

Question 10

the amount of heat added depends on

Answer 10

mass and temp ( specific heat capacity ) C

Question 11

the amount of heat energy needed to change temp of 1kg of a substance by 1 degree kelvin is

Answer 11

specific heat capacity units: J KG-1 K-1

Question 12

water has high shc and since humans have high water content we are considered to have

Answer 12

high thermal inertia ( takes a lot of energy to change temp )
- steal : 0.45
water” 4.18
air: 1.01

Question 13

heat flows from one object to another by 3 methods

Answer 13

• conduction ( solids )
• convection ( fluids )
• radiation ( doesn’t require a medium )

Question 14

space shuttle hear shield have

Answer 14

extremely low thermal conductivity

Question 15

water is — better than air at conducting removing heat

Answer 15

24 times bc air is a great insulator
water= 0.5
air; 0.02

Question 16

string vests utalises insulating properties of air bc

Answer 16

air in the holes of the vests are better insulators aka low conductivity than cotton

Question 17

the process of convection is when

Answer 17

heated fluid aka liquid or gas becomes less dense and rise up , moves away from the heat source.
The cooler denser fluid sinks to replace it.
2 convection cells r seen here
examples: convection of solar surface, tectonic movements driven by geo-thermal convection
q: convection heat transfer constant depends on shape, orientation, nature of the surface, = 7.1 m-2 k-1 )

Question 18

wind-chill is caused by

Answer 18

convection
( removes heated layer or air in contact w the skin )

Question 19

radiation relies on

Answer 19

photons so it can cross a vacuum , no physical link required
e= emissivity ( 0= bad 1= perfect )
omega thingy = Estefan’s constant
t= must be in kelvin for all equations