# Elton John rouses Atlantis crew - with Rocket Man

The crew of space shuttle Atlantis were woken this morning by Elton John's Rocket Man, followed by a personal message from Britain's national musical treasure. Sir Elton said: "Good morning, Atlantis, this is Elton John. We wish you much success on your mission. A huge thank you to all the men and women at NASA who worked on …

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#### geek question

geek question.

beeing in micro gravity,

the stores weigh not a lot.

but they do have momentum the crew have to control.

just how much energy / callories is it taking to move the tonne of stuff around the station.

just a though, on earth it would be a back breaker, but in micro gravity, I have no idea.

#### Think it's not the weight...

..but the mass. Once the object's moving, it's probably hard to control.

Any (wannabee) rocket scientists out there can give input?

#### kinetic energy

= (mv^2)/2

so per tonne @ say 2 m/s => 2 kJ, 4 m/s => 8 kJ, 6 m/s => 18 kJ, etc

without counting the – quite important factor of – inefficiency of say astronauts needing to move themselves around, absorb momentum, change trajectories etc

similar to the work done to ride a bicycle, without the friction

#### Thanks for that...

...still - Yikes! Think I'd rather move boxes at Tesco. Wouldn't like to be the receiver of a "Here you go!" shout.

Exponential. Scary.

Ta. - Andus.

#### Mass and Inertia

The energy to move a "tonne of stuff" depends on how fast you wish to accelerate the mass to get it moving, and then how fast you decelerate it to stop.

#### @David - well strictly

work = Energy / time

so it's the work to move a 'tonne of stuff' in a set amount of time that you are thinking of, while the Energy involved is a different question

although I acknowledge that I said 'work' done riding a bicycle when strictly it was Energy I was referring to;

so say you call 1 – strong – human power = 0.5 horsepower ~= 375 watts, that's 375 J/s, would allow acceleration of 100kg at a tad less than 3 ms^-2, deceleration similarly.

conversion back to F=ma gives F=300N, similar to the weight of a 30kg load at normal gravity, so sounds right in a 'constant load' scenario, although human peak power reaches closer to 1kW => 4+ ms^-2 for that 100kg load in say a <10% duty cycle. As Andus says, that could be a surprise when sent Tesco style – NASA Breakfasts are high protein :-)

compare a cricket fast bowler who bowls a 150g ball at 150km/h, kinetic energy of 130J, baseball pitcher 105mph, kinetic energy 163J; the difference being that the amount of time for acceleration is an important limiting factor

#### Alternatively / more precisely

Energy = work

power = [Energy|work] / time

although the basics are unchanged, it's Energy – Joules – that connects to speed, while power – watts, horsepower, etc – connects to acceleration/deceleration

#### Rocket Man - nice touch!

But I thought Endeavour carried out the last EVA? Was this unscheduled?

Anyway, Kudos to Sir Elton for that one.

#### Re: Rocket Man - nice touch!

Endeavour was the last EVA by shuttle crew members. This one was by ISS people.

#### Should've got David Bowie instead

A rousing rendition of Space Oddity would've made for an interesting last day.

That, or a snippet of Also Sprach Zarathustra.

...Shatner.

#### Didn't he get...

...one of the earlier mission alarm calls this year? My memory plays odd tricks these days, so that might be one of them there figment things...

#### Obviously just trying to cheer them up

"We know you love being an astronaut, but nobody else thinks it's important any more."

#### @ Jim McNally

or Stewie Griffin.

#### No Chris de Burgh then?

A spaceman came travelling.

Well, not anymore I suppose

#### No Thin White Duke?

Major Tom might have been more appropriate for the Space Oddity that is what remains of the Shuttle program.

#### The Firm?

They should have played the 1987 classic from The Firm, 'Star Trekkin'.

#### Gawd no

I remember how that starts.

Silence to full blast in about 3 seconds, talk about a rude awakening!

I would think it would be a great emergency siren though

#### Nice to see...

...on those IBM laptops, they're running XP..

Hope they've done the Tuesday update...

#### Sigh

From Mack Truck to Dustcart. What a way to go.

#### Really, NASA?

You could have gone with Kate Bush's cover, rather than Elton John. Kate did it /so/ much better.

#### You could have gone with Kate Bush's cover

Whew! I've wanted to "cover" Kate Bush since her first album....

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