1
Q
What is dangerous about space travel?
A
- Potential exposure to high levels of radiation / cosmic rays
- Pressure difference can lead to accidents
- Very small objects moving a high speed can damage spacecraft.
2
Q
How can space travel temperatures be dangerous?
A
- Extreme temperatures must be intergrated into design
- Atmosphere re-entry causes extreme high temperatures.
3
Q
How does newton’s first law affect space travel?
A
- Fuel accelerate to a velocity. Engines switch off, velocity constant.
- Thrust to halt motion as there is no friction/opposite force available.
4
Q
How does newton’s second law relate to take off?
A
- Take-off acceleration: F = ma
- Unbalanced take of force = Thrust - Weight
- Mass decreased as fuel used up. Increases acceleration.
5
Q
How does newton’s third law relate to space travel?
A
- Ejecting a part = equal and opposite force on remaining spacecraft.
- Equal force produced in opposite direction to ejection.
- Less mass increases acceleration - increaes velocity.
6
Q
What is the Big Bang Theory?
A
- The universe orgin: hot, dense
- Start of universe’s rapid expansion
- Galaxies moving away show universe is expanding.
- If it ever stops expanding it may collapse (Big Crunch.)
7
Q
What is gamma ray astronomy?
A
- Emmited by pulsars/black holes/ galaxies responsible for high gamma bursts.
8
Q
What is x-ray astronomy?
A
- Emitted by extremely hot gases/objects with temerature over one mill kelvin (K)
9
Q
What is ultraviolet astronomy?
A
- Emitted by very hot young stars (like sun)
10
Q
What is infrared astronomy?
A
- Observateries placed in dry, high altitude locations.
- Wavelength emitted shows temperature of source.
11
Q
What is microwave astronomy?
A
- Space telescopes because little penetrates atmosphere.
- Detected Cosmic Microwave Background (everywhere)
12
Q
What is radio astronomy?
A
- Observations made during cloudy / normal day
- Emitted by stars / galaxies / quasars, pulars, masers.
Physics
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