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Physics > Astronomy > Flashcards

Astronomy Flashcards

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1
Q

How to remember the order of the planets?

A

My (mercury) Very (venus) Excellent (earth) Mother (mars) Just (jupiter) Sent (saturn) Us (uranus) Nine (neptune) Pizzas (pluto)

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2
Q

Where is the asteroid belt in our solar system?

A

In between mars and saturn

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3
Q

What is the weight of a man of mass 85kg on the moon? (the gravitational field strength on the moon is 1.7)

A

Weight = mass x gravitational field strength 85 x 1.7 = 145N

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4
Q

Relationship between Orbital speed, time period and orbital radius

A

Orbital speed = (2 x pi x orbital radius)/time period V = 2(pi)r/t

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5
Q

How do you convert km to km/day into km/s?

A

Divide it by (24 x 60 x 60)

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6
Q

Mercury?

A

No atmosphere Heavily cratered

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7
Q

Venus?

A

Thick atmosphere of mostly CO2

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8
Q

Mars?

A

Thin atmosphere Some craters

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9
Q

Asteroid belt?

A

Asteroid: irregular lump of metal In orbits around sun

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10
Q

Jupiter?

A

Gas giant (mostly hydrogen)

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11
Q

Saturn?

A

Gas giant (mainly hydrogen) Ring system of rock an ice in orbit of planet

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12
Q

Uranus?

A

Gas giant (mainly hydrogen) Discovered with telescope 1781

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13
Q

Neptune

A

Discover with telescope 1846

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14
Q

What does the strength of the gravitational field between two objects depend on?

A

Mass Distance apart

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15
Q

What is the gravitational field between two objects INVERSELY proportional to?

A

The distance between them squared

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16
Q

What does gravity do?

A

-Causes the planets to orbit the sun -Causes the moon and artificial satellites to orbit the earth -Causes comets to orbit the sun

17
Q

What are comets?

A

Icy mud balls with elliptical orbits

18
Q

When are comets travelling fastest and why?

A

When they are closest to the sun Because the solar gravity decelerates them a they travel away from the sun

19
Q

Where do the tails of comets always point and why?

A

Away from the sun because it is blown by solar wind

20
Q

What is our galaxy called? What shape is it?

A

The milky way galaxy It is disc shaped

Physics (8 decks)

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