Man-made satellites

A

100

The orbital period of a geostationary satellite is ____ hours

24 hours

200

Geostationary satellite orbits in a special orbit named as _________   _________ Orbit

Geostationary Earth Orbit

300

The factors that affect the Escape Velocity of a planet are ___________ and __________

1) The mass of the planet

2) Distance, r from the center of the planet

400

The mass of spacecraft X is 1000 kg and the mass of scarecraft Y is 5000 kg.

Are the escape velocity from the Earth for spacecraft X different from spacecraft Y?

They are the same. 

This is because the escape velocity, v of a planetary body does not depend on the mass of the object attempting to escape the gravitational pull of the planetary body.

B

100

One benefit of high escape velocity of the Earth

1) Mantain a layer of atmosphere around the Earth

2) Aircrafts can fly at high levels without escaping into outer space

200

Convert 11 200 m/s to km/h

40300 km/h

300

Why commercial aircraft cannot escape into outer space?

Commercial aircrafts can fly at linear speed of 250 m/s. The linear speed is lower than the escape velocity of the Earth

400

Why do communication satellites need to be in geostationary satellite?

Communications satellites are often placed in a geostationary orbit so that earth-based satellite antennas (located on Earth) do not have to rotate to track them but can be pointed permanently at the position in the sky where the satellites are located.

- Always the same geographical location ;

- Orbit in Geostationary Earth Orbit ; 

- Orbits at the equator (Angle of inclination = 0^o)

C

100

What is a satellite?

Any object that orbits another planet/star is known as a satellite. 

200

Escape velocity is the ___________ velocity needed by an object on the surface of the Earth to overcome the ________ force and escape to _________

minimum ; gravitational force ; outer space

300

3 similarities of geostationary satellites and non-geostationary satellite

1) orbits the Earth

2) linear speed of the satellite, v

3) orbital period, T

400

How do we achieve Escape velocity?

Hint: 

Minimum kinetic energy + Gravitational potential energy = 0

Escape velocity, v = ?

v = square root (2GM/R)

D

100

Formula to calculate the linear speed of a satellite

200

Give 2 Movies / Stories about space and satellite 

Bonus question

Star wars, Interstellar ...

300

3 uses of non-geostationary satellite

1. Earth imaging

2. GPS

3. Weather forecast

400

Calculate the Escape Velocity from the Moon

Given  - Mass of the moon, M = 7.35 x 10²² kg

          - Radius, r = 1.74 x 10⁶ m

2.37 x 10³ m/s

E

100

Example of natural satellite

Moon - orbits the Earth

Earth - orbits the Sun

200

Earth's escape velocity is ________ m/s

11,200 m/s

300

What happens when linear speed of satellite is less than required speed?

1) Satellite will fall to a lower orbit and continue to revolve towards the Earth until it enters the atmosphere

2) Against air resistance generate heat

3) Satellite burn up

400

How to send a spacecraft into outer space?

- The launching of rockets requires large quantities of fuel

- To produce high thrust

- Enables the rocket to achieve escape velocity of the Earth