energy 1 Flashcards
(20 cards)
when does heat energy stop spreading out?
when it reaches equilibrium
what are some examples of low thermal conductors? (2)
insulators such as rubber and plastic
what is an example of high thermal conductors?
metal
how is heat spread out by radiation?
infrared rays
what do warm objects do to infrared radiation?
emit it
what do cold objects do to infrared radiation?
absorb it
what is infrared radiation?
thermal energy transferred by waves
what are some characteristics of infrared radiation? (2)
doesn’t need a substance to pass through
it can travel through a vacuum
what happens to hotter objects in terms of infrared radiation?
the more infrared radiation is emitted in a given time
what happens to objects with constant temperatures in terms of infrared radiation?
emits infrared radiation at the same rate it absorbs it
what happens to objects with decreasing temperatures in terms of infrared radiation?
it emits more than it absorbs
what happens to objects with increasing temperatures in terms of infrared radiation?
it is absorbing more than it is emitting
what does geothermal mean?
hot earth/rocks
what happens when water is pumped underwater to the hot rocks?
it turns to steam and drives a turbine
what are some advantages of geothermal energy? (3)
renewable
no fuel needed
no CO2 produced
what are some disadvantages of geothermal energy? (2)
only works in some places
built in unstable places
what happens when we split a nucleus apart?
releases lots of heat energy
how does biomass work?
turns stuff into heat energy by burning
what happens when we apply force to an object?
it can change shape
what is hooke’s law?
the law of the extension of a spring is directly proportional to the force applied
