Front | Back |
If the sun would turn into a black hold right now, what would happen to the Earth?
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- Orbit of Earth not change
- the sun would feel the pull towards the centre |
Suction and the Black hole
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Only happens when u are close to the black hole
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Most important force on the scale of the Universe
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Gravity
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What fights against gravity?
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MOTION
- whether initial explosion of the universe/ ordinary motion |
Gravity vs. Motion
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Depends on how packed the mass is together
- Gravity stronger more mass and closely packed - Moon is about as densely packed as the Earth but LESS mass therefore less gravity |
Min Speed (velocity) to escape Earth's gravity
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11.3 km/s to escape Earth's gravity
- 6379 kms up |
What if the earth had more mass would the escape velocity be higher?
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- YES if had more mass and KEPT its size gravity stronger there fore escape velocity would be higher
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How do astronauts float in space?
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Astronauts gravity is about 8.8
- Earth's gravity is 9.8 - Astronauts in constant free fall, they do crash like on earth becuase they are always moving and circling the earth |
What does Einstein's SR tell us about matter and energy?
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SR= tells us that matter and engery can not go faster than the speed of light
SR = tells us speed has a limit , motion |
What does SR tell us about matter/ engergy and gravity?
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Gravity has no known limit, similar
- Heavy objects, gravity will always be able to over come even the fastest motion and all other phenomena |
Black Hole: velocity, reltaion to speed of light, escaping ability of light
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Escape velocity is HIGHER than the SPEED OF LIGHT,
- nothing can escape the black hole since nothing can go faster than BH - depends on how densily packed toegher, light cant escape |
Why called Black and Hole descibe the meaning of each
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BLACK: b/c no light can escape hence the compact object itself is invisible
HOLE: is like a whole in observable universe. If u enter a black hole, you leave the region of the Universe that we can observe with a telescope- Never return |
If the earth turned into a black hole how would it feel?
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- you would not feel a big difference
- cold - dark b/c no sun - the orbit would not change b/c does not circle the sun cirlces the other centre of the universe |
What would happen the closer you get to a black hole?
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- it doesnt SUCK in matter
- Black hold just a much more compact form of the same amount of mass - a weird orbiting happens spiral in about 10 km away - in front of the BH is dust around them |
What would happen if the Sun turned into a black hole?
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- the force of gravity on Earth would be the same and the orbit would not change at all
- Gravity is determined by mass! |