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Physics > Astrophysics New > Flashcards

Astrophysics New Flashcards

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1
Q

universe

A

a large collection of billions of galazies

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2
Q

galaxy

A

a large collection of billions of stars

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3
Q

planetary system

A

planets and other astronomical objects orbit around a star at the centre

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4
Q

name of the galaxy Earth is in

A

Milky Way Galaxy

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5
Q

weight definition

A

the force acting on an object due to gravitational attraction

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6
Q

correlation between mass of a planet and its gravitational field strength

A

the greater its mas the greater its gravitational field strength

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7
Q

what does a higher gravitational field strength mean in terms of forces

A

large attractive force towards the centre of that planet or moon

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8
Q

gravitational field strength of earth

A

10N/kg

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9
Q

g of moon

A

1.7N/kg

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10
Q

g of jupiter

A

24.7N/kg

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11
Q

g of sun

A

293N/kg

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12
Q

g of saturn

A

10.5N/kg

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13
Q

g of uranus

A

9N/kg

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14
Q

g of mars

A

3.7N/kg

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15
Q

what body does a planet orbit

A

the sun

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16
Q

what body does a moon orbit

A

a planet

17
Q

what body does a comet orbit

A

the sun

18
Q

what body does an asteroid orbit

A

the sun

19
Q

what body is the sun

A

star

19
Q

what bodies do artificial satellites orbit

A

the Earth

20
Q

what is the rule for a body orbiting another body

A

the small body must orbit around larger bodies

21
Q

what is orbital motion a result of

A

gravitational force of attraction acting between two bodies

22
Q

where does the gravitational force of a body act

A

towards the centre

23
Q

similarities in the way planets orbit the sun

A

-orbits are all slightly elliptical
all orbit in the same plane
-all travel in the same direction around the sun

24
Q

differences in the way planets orbit the sun

A

-orbit at different distances from the sun(orbital radius)
-they orbit at different speeds
-they all take different amounts of time to orbit the sun

25
Q

how does the distance of the moon from the planet affect the time taken to complete each orbit and the speed of the orbit

A

-closer distance = shorter time, greater speed

26
Q

orbit shape of a comet

A

-highly elliptical

27
Q

how does the orbit speed of a comet vary

A

-varies greatly as distance from sun changes
-closer to the sun = increasing speed and vice versa

28
Q

how does the direction and plane of a comet’s orbit differ from a planet’s orbit

A

direction and plane can be different

29
Q

average orbital speed equation

A

v = 2πr/T

T = orbital period

30
Q

orbital period

A

time taken for an object to complete one orbit

31
Q

stellar evolution and cosmology not done

A

.

Physics (14 decks)

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