rotational motion and astrophysics

Question 1

centripetal force

Answer 1

is directed towards the centre of the circle of rotation

Question 2

moment of inirtia

Answer 2

defined as an objects resistance to angular acceleration about a given axis

Question 3

conservation of motion

Answer 3

total angular momentum before impact will equal the total moment after excluding external torque

Question 4

what is gravitational potential

Answer 4

is the point in space that is defined as the work done in moving a unit mass from infinity to that point

Question 5

escape velocity

Answer 5

is defined as the minimum velocity required to allow a mass to escape a gravitational field to infinity where the mass achieves zero kinetic energy and maximum (0) protentional energy

Question 6

inertial frame of reference

Answer 6

one which the velocity of the coordinate system is constant or zero

Question 7

non-inertial frame of reference

Answer 7

its where there coordinate system is accelerating
this means its changing speed or changing direction by travelling in a curved path

Question 8

the equivalence principle

Answer 8

states that the effects of gravity are exactly equivalent to the effects of acceleration

Question 9

geodestic

Answer 9

the path with the shortest distance between two points

Question 10

event horizon

Answer 10

is the boundry of a black hole
since a black hole has a large enough gravitational pull that nothing can esacape it

Question 11

black body radiation

Answer 11

refers to the energy emitted from a black or non-reflective body

Question 12

schwarzchild radius

Answer 12

is the distance from its centre to its event horizon

Question 13

luminosity

Answer 13

total amount of energy emitted by an astronomical object per unit of time