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Frontiers In Physics > Astrology > Flashcards

Astrology Flashcards

1
Q

What is the distance from Earth to the sun known as?

A

1AU (1 astronomical unit)

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2
Q

What is the value of 1AU in metres?

A

1.5x10^11 m

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3
Q

How long does it take light from the sun to reach Earth? In seconds & minutes.

A

500 seconds & 8 mins

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4
Q

What is a solar mass & its quantity?

A

The mass of the sun (2x10^ 30 kg)

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5
Q

Where is most of the mass of the solar system?

A

The sun, the mass of the sun is much greater than that of all the planets combined.

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6
Q

What word is used to describe the motion of the Sun?

A

Rotational

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7
Q

What equation is associated with the motion of the Sun?

A

L = Iω (L = angular momentum, I = moment of inertia & ω = angular frequency)

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8
Q

What word is used to describe the motion of a planet?

A

Orbital

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9
Q

What equation is associated with the motion of planets?

A

L = rp (L = angular momentum, r = radius of orbit & p = momentum where p=mv)

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10
Q

Where is most of the angular momentum of the solar system held?

A

The planets have a lot more angular momentum than the sun.

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11
Q

Why are stars so much fainter than the sun?

A

Due to the inverse square law.

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12
Q

What is the difference between luminosity & flux?

A

L = Luminosity ( J s^-1 ) is the light EMITTED per second
F = Flux ( J s^-1 m^-2 ) is the light RECIEVED per unit area per second

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13
Q

What is the definition & quantity of a light year?

A

Distance light travels in a vacuum in a year ~ 9.5x10^15 m

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14
Q

What angle does the sun subtend?

A

0.5 degrees

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15
Q

What is an arcminute?

A

1’ = 1/60 degree

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16
Q

What is an arcsecond?

A

1” = 1 / 3600 degree

17
Q

What is the definition & quantity of a parsec?

A

Distance at which 1AU subtends 1” (arcsecond) ~ 3.1x10^16 m
Approximately the distance to the nearest stars

18
Q

What is Keplers 1st law?

A

Planets travel in elliptical orbits with the sun at one focus

19
Q

What is the semi major axis, a?

A

It is half of the longest diameter of an ellipse

20
Q

What is a aphelion?

A

The point in the orbit of Earth when it is farthest from the Sun

21
Q

What is a perihelion?

A

The point in the orbit of the Earth when it is closest to the Sun

22
Q

What is Kepler’s 2nd law?

A

A line connecting a planet to the sun seeps out equal areas in equal time (planets move faster when they are closer to the sun)

23
Q

What is keplers 3rd law?

A

The orbital period (P) squared is directly proportional to the average distance from the sun (a- semi major axis) cubed

24
Q

What is newtons 1st law?

A

In the absence of force, objects travel in a straight line with constant velocity, no net force means no acceleration

25
Q

What is newtons 2nd law?

A

A force applied to a body produces an acceleration proportional to its mass F=ma

26
Q

What is newtons 3rd law?

A

Every action has an equal and opposite reaction

Frontiers In Physics (1 decks)

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