Dynamics & Space Flashcards
what is the reaction to: the rocket engines exert a force on the exhaust gases
the exhaust gases exert a force on the rocket engines
define: galaxy
a collection of stars, dust, remnants and gas held together by gravity
distance = ?
area under speed-time / velocity time graph
Two tennis balls are hit horizontally from the same height at different speeds. Ball A at 40 ms-1 and Ball B at 10ms-1 which will hit the ground first?
neither; they will hit the ground at the same time
define: planet
a celestial body that orbits a star (and possess sufficient mass to exist in a spherical shape)
how old is the universe
13/14 billion years old
relationship linking: acceleration, force and mass
a = F/m
what are the forces acting vertically on a climber falling with an air descender (balanced)
^ (air) friction / drag / air resistance
^ force / tension of rope
\/ force of gravity / weight
uses of a geostationary satellite
telecommunications and weather observation
how do you calculate from light years to metres?
(3.0x10^8)x(ly x365x24x60x60)
define: star
a luminous sphere of gas that emits light and heat, held together by its own gravity
define: geostationary satellite
a satellite positioned above a point of the earth’s surface. Its period of orbit is equal to earths.
graph showing vertical velocity of a ball after it leaves the player’s racquet horizontally
directly proportional graph
define: light year
the distance light travels in one year ( 1 ly = 9.5x10^15 m )
uses of an orbiting satellite
mapping earth, weather observation and military purposes
