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Questions tagged [velocity]

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2
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1answer
36 views

How to calculate velocity components of a point on Mars surface w.r.t. Mars center?

I found altitude, speed and acceleration data of old mission Phoenix during EDL phase, but they are referred to Mars c.o.g. rather than to ground or to landing site: Position and velocity (...
19
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2answers
5k views

What eliminates the velocity when occupants return from ISS to earth, and how much?

The ISS has an orbital velocity of ~28000 km/h; the velocity $v$ relative to the landing site of the descent module is probably even higher than that most of the time. Once the occupants have landed, ...
22
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3answers
4k views

How hard do you have to throw something off the ISS to make it deorbit?

During Expedition 41 Reid Wiseman and Alexander Gerst replaced a failed pump on the outside of the ISS. I am guessing they took the broken pump back inside the ISS and returned it to earth in one of ...
6
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1answer
88 views

How to calculate the speed of rotation of a given point on the Earth's WGS84 ellipsoid, about its axis?

Launches often happen near the equator in order to take advantage of Earth's rotation speed. This is why more launches are towards the East than towards the West. How can one calculate the speed of ...
-4
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1answer
89 views

benefits of higher rocket speed [closed]

what benefits will a rocket get if it is made to go at a speed close to light... like 3 X 10^6? if the rocket is supplied with more efficient fuel and designed to obtain lesser drag there are ...
5
votes
1answer
482 views

Maximum velocity achieved by solar sail

What is the maximum (theoretical) velocity that can be achieved by solar-sail technology? Can we get close to the speed of light with that?