physuchs Flashcards
(43 cards)
adjusting variable resistor does what?
adjust the current
when a magnetic field is cut a what is the 3 things produced?
p.d and current is induced
forms a complete circuit
there will be no force applied to an object wiht an current in an electromagnetic field because
conductor parralle to magnetic field
a way to reverse the force in a circuit
rerverse battery
where does fusion occur natrually
in a star
in nuclear fission what does it give off?
energy , gamma rays , 2 -3 neutrons and a
nuclear fission causes what?
a chain reaction
in nuclear fusion what does it release
1 neutron an lots of energy
what do the nuclei do in nuclear fusion
they fuse together
a possibility of nuclear fusion is fusing what?
what element will it give off
deutrium and tritrium
gives of helium
asteroids have what type of orbit
eliptical orbit
the moon orbits earth - what is this referred as?
natural sattelite
what is a nebula
a massive cloud of dust and gas
when a nebula comes together what happens to it
in terms of energy store
potential energy turns into kinetic energy
what is the chain of how its made starting from a nebula
to a protostar to a main sequence star
what happens to a protostar at the end of its life and why
expands into a red giant as it loses energy because of the hydrogen fuel is running out causing it to expand
a red giant then runs out of hydrogen fuel and what happens to it ?
it shrinks and becomes a white dwarf - very hot
cools down after billions of years becoming a black dwarf
when the red super giant is very big what does it turn into to and how?
goes supernova-massive explosion
no fusion so all electrons and protons together to make neutrons - making it a neutron star
what if the red super giant is really big
keep collapsing under gravity and ends up being a black hole and loses all its mass
what ddoes gravitational force do from the planet
pulls a planet towards it
asteroids do what when near a star
they travel alot quicker in their orbit compared to when they re further away
whats the evvidence for the big bang
light from faar away staars have a stretched wavelength
what does a stretched wavelength mean?
we then have red light
what is red shift
means everythings expanding - more expansion from futher stars
