Red shift and the Big Bang Flashcards
Explain how the red-shift supports the big bang
Further galaxies are moving away from us. Furthest galaxies have greater red-shift that closer galaxies. Therefore this means that the Universe is constantly expanding and started in one place. This is represented by the Big Bang theory all matter started in one place.
What provides the centripetal force on the satellite orbiting Earth?
Earth’s gravitational attraction
What are the two factors that determine the size of the centripetal force on the satellite orbiting Earth?
Mass of satellite and the radius of orbit from Earth.
To stay in its present orbit around the Earth, each satellite must move at a particular _____.
speed
What is the difference between speed and velocity?
Speed is a scalar quantity but velocity is a vector quantity. When you change the direction the velocity also changes.
What is a scaler quantity
When a quantity only has magnitude
What is a vector quantity?
When a quantity has magnitude and direction.
Why is the velocity of the satellite always changing?
As the direction of the satellite constantly changes. So, therefore, the velocity will change as velocity is a vector quantity.
What is nuclear fission
When the atom splits it forms two new lighter elements that are roughly the same size.
Two or three neutrons are also released when an atom splits. If any of these neutrons are moving slow enough to be absorbed by another nucleus they can cause more fission.
What is nuclear fusion
In nuclear fusion, two light nuclei collide at high speed and join to create a larger, heavier nucleus. Hydrogen nuclei can fuse to produce a helium nucleus.
What is the Doppler effect?
an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other.
