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 Physics Forum Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

## Helpful physicist needed - Physics Forum

### Helpful physicist needed - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.

#11
11-14-2006, 09:20 PM
 Charles Lyttle Guest Posts: n/a

In that case, d = 0.5*a*t^2.
a=32 ft/sec^2
t=24*3600 sec = 86400sec.
d=0.5*32*86400^2 =1.194e11 ft = 22,621,100 miles.
Now you have to accelerate up for 1/2 the trip and then back down to
match velocities with Mars. Mars moves slower than Earth, so decleration
would have to begin before the halfway point, so you don't get the full
22,621,100 miles. therefore at 1g, the two day trip is only possible
when Mars and Earth are less than about 41,000,000 miles apart and the
velocity of Earth assists (distance is decreasing), rather than hinders.
If the distance is increasing, then extra acceleration is needed to shed
velocity and bring the vehicle to rest relative to Mars before beginning
to accelerate toward Mars. Now go back to a physics book, check how much
energy is needed to accelerate/decelerate the payload, then the fuel
energy density, etc.

If your developer wants to include a 2day trip to Mars, then he should
be sure to have a ship that can accelerate, and can carry enough fuel
for the voyage. No magic ships permitted.

Note that it isn't impossible to get to Mars in 2 days (about one week
out of every century), it just would take all the resources of several
major countries to do so.

 Tags helpful , needed , physicist

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