Physics

Question 1

Idea of Earth- india

Answer 1

In India people believed that the Earth was supported on the back of a giant wooden turtle.

Question 2

Idea of Earth- thailand

Answer 2

People in Thailand believed that a
solar eclipse occurred when a god
called Rahu swallowed the Sun.

Question 3

Idea of Earth- china and india

Answer 3

People in China and India believed
that the Earth was flat. It was
supported by 12 pillars.

Question 4

Idea of Earth- greece

Answer 4

People in Greece thought that the Earth was the centre of the universe

Question 5

Describe the geocentric model.

Answer 5

In astronomy, the geocentric theory of the universe is the idea that the Earth is the center of the universe and other objects go around it. Belief in this system was common in ancient Greece.

Question 6

State some problems with the geocentric model.

Answer 6

The stars change brightness
Some planets appear to go backwards. This is called retrograde

Question 7

What is the motion called when planets appear to go backwards?

Answer 7

Retrogade

Question 8

What is the heliocentric model?

Answer 8

The theory that the Earth revolves around the Sun is called the heliocentric theory.

Question 9

What is our current model at the moment?

Answer 9

Our current model of the Universe says that our planets orbit around our sun, and that our solar system is a small part of our galaxy, which isn’t in the centre of the Universe.

Question 10

What is the big bang theory?

Answer 10

The Big Bang Theory is the leading explanation about the origin and evolution of the universe. It describes how the universe began from an extremely hot, dense state and expanded over time to its current form.

Question 11

What can be predicted from the Big bang theory about the size of the universe?

Answer 11

The Big Bang theory predicts that the early universe was a very hot place and that as it expands, the gas within it cools and it is still expanding

Question 12

What comes after the main sequence star?

Answer 12

Either red giant or red super giant

Question 13

What comes after a red supergiant

Answer 13

A supernova

Question 14

What comes after a red giant

Answer 14

A white dwarf

Question 15

What is a satellite?

Answer 15

An object that orbits another planet (our Earth)

Question 16

Name 1 satellite

Answer 16

The moon (natural), the international space station (artificial) Hubble Space craft (artificial)

Question 17

What are some uses of satellites? name 3

Answer 17

TV and radio signals
Communication
Weather forecasts
Gathering data about space
Studying the Earth and Space

Question 18

What is a geostationary satellite?

Answer 18

A geostationary satellite is in an orbit that can only be achieved at an altitude above 35000ft and which orbits around the equator

Question 19

What is a geostationary satellite used for?

Answer 19

Used for communications, satellite TV, weather forecasting, intelligence, global positioning system (GPS)

Question 20

What is polar orbit?

Answer 20

● Low orbit around the Earth
passing over North and
South poles.
● Earth rotates underneath
them as they orbit.
● Used for large-scale
mapping and global weather
monitoring.

Question 21

Which part of the Earth does the satellite pass over? - geostationary

Answer 21

Orbits over the Equator

Question 22

Which part of the Earth does the satellite pass over?- Low polar orbit

Answer 22

Over the poles

Question 23

Which part of the Earth does the satellite pass over? -LEO

Answer 23

Anywhere above the Earth

Question 24

How long does the satellite take to complete one orbit? - Geostationary

Answer 24

24 hours

Question 25

How long does the satellite take to complete one orbit? Low polar orbit

Answer 25

Less than a day

Question 26

How long does the satellite take to complete one orbit? LEO

Answer 26

90 Mins ISS Less than a day

Question 27

Does the satellite stay above the same point on the earth all the time? Geostationary

Answer 27

Yes

Question 28

Does the satellite stay above the same point on the earth all the time? Low polar orbit

Answer 28

No

Question 29

Does the satellite stay above the same point on the earth all the time? LEO

Answer 29

No

Question 30

What are the risks of space missions?

Answer 30

- solar flares - space radiation - rely on parachutes to slow there descent - top of rocket can explode during take off -As they travel back, the spacecraft get very, very hot due to friction

Question 31

What is a solar flare? What can they do?

Answer 31

Solar flare- a process that produces a large amount of radiation emitted by the sun A solar flare can stop all the on-board computers from working

Question 32

Benefits of the space programme.

Answer 32

- The liquid-cooled suits used by racing-car drivers and fire-fighters are based on the Apollo astronauts' spacesuits. - The shock-absorbing materials used in sports shoes were developed for spacesuits.

Question 33

How does galileos telescope work?

Answer 33

Galileo used a telescope with two lenses. This is called a refracting telescope. The objective lens produces a real image of a distance object. The eyepiece lens magnifies the image of the object. This is how Galileo could observe the moons in orbit around Jupiter. Before that most people thought that the Earth was at the centre of the Solar System

Question 34

Why does refraction happen?

Answer 34

Refraction happens because the light wave changes speed

Question 35

Label different parts of a refracting telescope.

Answer 35

See photos

Question 36

Explain 1 similarity and 1 difference of reflecting and refracting telescopes.

Answer 36

The main difference between a refracting telescope and a reflecting telescope is how they magnify light from distant objects. A refracting telescope uses convex lenses to refract or bend light toward a focal point, while a reflecting telescope uses a concave mirror to redirect light toward a focal point. Both reflecting and refracting telescopes are designed to collect and focus light from distant objects, allowing us to observe them in greater detail. They both use optical systems to magnify images.

Question 37

Name some techniques astronomers use to find habitable planets.

Answer 37

Astronomers use computers to estimate the 'habitable zone' around other stars. This is the region where an exoplanet would be at a suitable temperature. For there to be life on a planet like Earth there needs to be liquid water, so it cannot be too hot or too cold. You need an atmosphere with oxygen for life like the life on Earth

Question 38

What does SETI stand for?

Answer 38

SETI is the Search for Extra-Terrestrial Intelligence

Question 39

What is an exoplanet?

Answer 39

A planet orbiting a star that is not our Sun