Did the moon lander have enough fuel to get off the moon?

Commemorating the 40th Anniversary of Apollo 11's mission to the Moon, 1969-2009.

Re: Did the moon lander have enough fuel to get off the moon?

Postby Zubenelgenubi » Thu Jul 09, 2009 5:59 pm

wtrix wrote:I even provided the link about the differences between mass and weight. To be said once more. You have to lift the weight and accelerate the mass. Regarding the mass you're correct, but first you have to counteract the gravity.


I think mortisthewise was objecting to this:

...instead of 4670kg you are lifting only 778kg ...


Which isn't correct, even though the point you were making is understood: you still have to lift 4670kg, it's just that 1kg doesn't weigh as much on the Moon as it does on Earth. If the example was in pounds, then the division would work, but kilograms are a unit of mass, not weight...
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Re: Did the moon lander have enough fuel to get off the moon?

Postby wtrix » Fri Jul 10, 2009 5:26 am

Zubenelgenubi wrote:
wtrix wrote:I even provided the link about the differences between mass and weight. To be said once more. You have to lift the weight and accelerate the mass. Regarding the mass you're correct, but first you have to counteract the gravity.


I think mortisthewise was objecting to this:

...instead of 4670kg you are lifting only 778kg ...


Which isn't correct, even though the point you were making is understood: you still have to lift 4670kg, it's just that 1kg doesn't weigh as much on the Moon as it does on Earth. If the example was in pounds, then the division would work, but kilograms are a unit of mass, not weight...



Mybad. Point taken. The right unit instead of pounds however (SI units in this context) would have been kgf or kilopond as stated sometimes. The correct saying, thus, is: ...instead of 4670kgf you are lifting only 778kgf, but you're still accelerating 4670kg.
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Re: Did the moon lander have enough fuel to get off the moon?

Postby MeteorWayne » Fri Jul 10, 2009 11:57 am

MOD HAT ON***

Just a reminder. This forum is to dsicuss the Apollo 11 Mission, and the other Apollo Missions.

Any off topic posts can and will be moved to other fora, such as the Moon Hoax, and Other Moon Conspiracies threads in The Unexplained.

They will be moved without warning, so if your post has disappeared, look in those threads in The Unexplained.

Please (that's an official please) Stick to the Apollo subject

MOD HAT OFF****

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