topic 7 Flashcards
which is correct for both force and velocity?
A) force - scalar, velocity - scalar
B) force - scalar, velocity - vector
C) force - vector, velocity - scalar
D) force - vector, velocity - vector
D) force - vector, velocity - vector
state the name of the force that keeps the satellite in orbit around earth
centripetal
describe what is meant by redshift
wavelength increased and frequency decreased as the star moves away from us
explain how redshift provides evidence for the big bang theory
the big bang theory says the universe is expanding with galaxies moving away from us
state what the m in CMB radiation stands for
microwave
state what is meant by cosmic background radiation
radiation that comes from all over the sky
explain how the presence of CMB radiation provides evidence for the big bang theory
the big bang had a beginning that gives out radiation
state one other idea about the solar system that had changed over time
pluto is no longer a planet
some stars originate as a nebula. describe the process that then occurs to produce conditions necessary for nuclear fusion in a new star
nebula collapses under gravity and very high temperatures and pressures are required
state how the brightness of a main sequence star changes with its temperature
the higher the brightness the greater the temperature
state how the brightness of a main sequence star changes with its mass
the greater the mass the higher the brightness
a nebula may evolve into a main sequence star, such as the sun. explain how a nebula may evolve into a main sequence star
nebula is a cloud of gas and the particles in the nebula are pulled together by gravitational force. it becomes hot enough for nuclear fusion
