reducing unwanted energy transfers

Question 1

how can energy be dissipated

Answer 1

conduction
convection
radiation

Question 2

convection dissipation

Answer 2

part of fluid that is warmer than the rest rises and creates a convection current

Question 3

conduction dissipation

Answer 3

vibrations are on between particles in a solid

Question 4

give an example of a good and a bad thermal conductor

Answer 4

good = metals
bad = wood

Question 5

radiation dissipation

Answer 5

Infrared is absorbed and emitted easily by dull surface but poorly in light surfaces

Question 6

2 ways to reduce energy wastage

Answer 6

lubrication
insulation

Question 7

explain lubrication

Answer 7

liquids reduce the friction between moving parts, reducing heat that dissipates into the surroundings

Question 8

explain insulation

Answer 8

rate of heat transfer is reduced by increasing the thickness of a material, using materials with lower thermal conductivity, or reducing the temperature difference.