Please enable JavaScript.
Coggle requires JavaScript to display documents.
Space (Describe what eventually happens to a white dwarf (-Temperature…
Space
-
-
Briefly explain how the value of the average mass-energy density of the Universe will determine whether the Universe is open or closed
-A closed universe would occur when the density of the universe is greater than the critical density
-This would make the gravitational force strong enough to stop the expansion
-
Define electric fields and gravitational fields stating the similarities and differences between them
-Electric field = Region where charged objects experience a force
-Gravitational field = Region where masses experience a force
-Both obey inverse square law
-Both radial for point objects
-Both have an infinite range
-Electric fields are attractive and repulsive but gravitational fields are only attractive
-Electric fields are much stronger
-Electric fields only act on charged objects but gravitational fields act on all matter
-Electric fields can be shielded
-
-
-
Give two reasons why measurements of a star's intensity are often made from above the Earth's atmosphere
-
-
-
-