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  • 0 posts edited
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  • 15 votes cast
Oct
6
comment Motorbike with parachute vs normal skydive
All energy is still there in form of sideways movement, and will leave in form of friction (heat) towards the surface (and air with the parachute) when the biker glides. Look at this video, as long as they glide, nothing happens, it is when they finally hit the side of the road that the concrete barrier that sideways force has to become something else (and may hurt the biker) youtube.com/watch?v=4WmjeeZ44B8. But in my example there is no barrier to hit, so "my biker" would continue to glide until the parachute has absorbed all energy, and that should not be harmful.
Sep
4
accepted Motorbike with parachute vs normal skydive
Mar
21
revised Motorbike with parachute vs normal skydive
Added a figure to describe the problem
Mar
20
comment Motorbike with parachute vs normal skydive
Please clarify what force will kill him? It is not lethal to free-fall 1m, and it is not lethal to glide on the tarmac at 200km/h.
Mar
20
revised Motorbike with parachute vs normal skydive
more language
Mar
20
revised Motorbike with parachute vs normal skydive
Better language to clarify the question.
Mar
20
comment Motorbike with parachute vs normal skydive
I was thinking along the same line.
Mar
19
asked Motorbike with parachute vs normal skydive
Oct
9
accepted In the calculation of sunrise, where do the magic numbers come from?
Oct
8
revised In the calculation of sunrise, where do the magic numbers come from?
Better question.
Oct
8
asked In the calculation of sunrise, where do the magic numbers come from?
Jul
9
awarded  Yearling
Jul
29
comment Why is 55-60 MPH optimal for gas mileage of a passenger car?
@Georg - That must be the CO2 tax that if the car emits less than 120g/km it is a "green car", and I guess that those cars must drive a specified speed when they measure.
Jul
14
comment Are regular light bulbs better for the eyes than CFLs or “tube lights”?
There is tubes with a more yellow light that is softer on the eyes, and in combination with the flicker free technologies they can come quite close to the lightbulbs.
Jul
10
awarded  Supporter
Jul
10
revised Calculating time for a fully charged UPS
a note on age...
Jul
10
revised Calculating time for a fully charged UPS
better syntax
Jul
10
revised Calculating time for a fully charged UPS
clarified my answer
Jul
10
answered Calculating time for a fully charged UPS
Jul
10
awarded  Teacher