What is the equation for horizontal projectile motion?
Vh = S/t
Vh = Horizontal velocity (ms-1)
S = Displacement
t = time
What is the equation for vertical acceleration?
Vv = Uv + at
Vv = Vertical Velocity (ms-1)
Uv = Initial velocity (ms-1)
a = acceleration (ms-1)
t = time (seconds)
How would you calculate average vertical velocity of a projectile?
Calculate final vertical velocity.
Find the area below the line of the velocity-time graph it represents (triangle).
How many galaxies are in the universe and how long ago was the big bang?
- 2 trillion (2 X 10^12)
- 14 billion years ago
What is an asteroid and the moon?
Asteroid = An object that orbits the sun but does not meet all the requirements to be a planet.
Moon = A natural satellite that orbits a planet.
What is an exoplanet and the galaxy?
Exoplanet = A planet that orbits a star outsie our solar system
Galaxy = A cluster of gravitationally bound stars, gas and dust clouds.
What are geostationary satellites?
- Has a period of 24 hours
- Orbits at an altitude of 36000 km
- Orbits the same point on the Earth’s surface.
What can geostationary satellites be used for?
- Phtograph cloud cover for weather forecasts.
- Communication
What are polar orbiting satellites?
- Collect data measurements twice a day at the same point on the Earth’s surface at the same time each day.
- Three of them working together can observe the entire planet every six hours.
Why are telescopes useful?
- Forms of EM radiation blocked by Earth’s atmosphere, can be detected by telescopes placed in orbit around the Earth.
