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# If you're standing on the Moon holding a pen, and you let go Answered

Thought this deserved some looking at:
can you answer these questions right?

13. If you are standing on the Moon, and holding a rock, and you let it go, it will:
(a) float away
(b) float where it is
(c) move sideways
(d) fall to the ground
(e) none of the above

25. When the Apollo astronauts wre on the Moon, they did not fall off because:
(a) the Earth's gravity extends to the Moon
(b) the Moon has gravity
(c) they wore heavy boots

My prediction is that most of you will get the question right, as instructables is a scientific community.

http://www.phys.ufl.edu/~det/phy2060/heavyboots.html

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## 40 Replies

westfw (author)2009-04-27

Here's one to think about, since you've all been exposed to WRONG pictures, although you might KNOW the actual numbers... You make a SCALE model of the earth/moon system. You use one of those beach-ball earth globes for the earth, and it's 30cm in diameter. How big will the (scale) moon be, and how far away from the beach-ball does it need to be?

NachoMahma (author)2009-04-27

. Wow! I was pretty close on the size, but waaaaayyyyy off on the distance. I placed it much closer.

Zaphod Beeblebrox (author)2010-01-23

"Is it me or is it hot in here?" "No it's you,your butt's on fire"

kelseymh (author)2009-04-27

Here's a follow up to put things even further into perspective: Once you've gotten Westfw's answer correct, where do you put the sun (i.e., how far away), and how big should you make it?

Lithium Rain (author)2009-04-27

Next you'll want me to put Pluto in there...oh wait it's not a planet anymore, so it's all good.

Sunbanks (author)2009-04-27

Poor Pluto :(

flio191 (author)2009-12-17

Pluto was never a planet!

Kiteman (author)2009-04-27

I go the other way - I start with a beachball as the Sun, then 50m away I hold a dried pea to be the Earth, and 4cm from that I hold a mustard seed as the Moon.

kelseymh (author)2009-04-27

True! If I were building a solar-system model I'd always start with the Sun and work outward. However, given Westfw's original question, I wanted to put things into that perspective.

kelseymh (author)2009-04-27

Oh, and the answer to that question -- use a softball, and put it 1/3 of the way to first base (assuming the Earth is at home place).

Gorfram (author)2009-06-08

Not as science-ey, and not multiple choice, but the answer to this question clearly indicates whether or not you've got the concept down: What is 100% of 37?

Goodhart (author)2009-12-17
37,  I would think,  unless you are reading it differently than I am :-)

Gorfram (author)2009-12-17

You got it, Goodhart. :)

It's not a trick question, but it's so simple that It's a little hard to believe that it isn't. This one's a little easier that way, but still stumped many of my mother's 9th  grade math students: What is 37% of 100?

Goodhart (author)2009-12-18
Maybe I shouldn't answer this one,  since I do percentages and fractions in my head all the time :-)  (i.e. at the store my wife asks me what 30% \$29.99 and I give it to her within a few seconds; so this one of yours is as easy as the other one was ;-)

Goodhart (author)2009-12-19
doesn't look like anyone else is going to try,  so:  37,  of course.

100 %  of  N   is the same as  that same  N  % of 100.

flio191 (author)2009-12-17

a percentage, preposition, integer and eroteme!

yourcat (author)2009-12-18

D & B.

n8man (author)2009-04-26

13. d 25. b Easy

Goodhart (author)2009-12-17
It is interesting that, with the second question;  c is a viable answer ONLY if b is also true  :-)

A heavy base (where there is gravity)  makes for a steady stance.

Rotten194 (author)2009-06-07

13: D, as the moon has gravity, though weaker than Earth's 25: B, as the moon has gravity, though weaker than Earth's

uncljoedoc (author)2009-06-06

If 'you' let the pen go on the moon' it would just float away 'from me'

lemonie (author)2009-06-07
The correct answer is demonstrated here:

dombeef (author)2009-04-27

13. E 25. D

Spl1nt3rC3ll (author)2009-04-26

#13 is d. #25 is b.

Tool Using Animal (author)2009-04-26

#13 is poorly worded, e would be a perfectly reasonable answer also.

PKM (author)2009-04-27

How? Is "fall to the ground" not a sufficiently good explanation?

Tool Using Animal (author)2009-04-27

No, it is not, since one of the definitions of ground is "The surface of the Earth", an unambiguous statement would have been "fall to the surface of the moon".

Bigev (author)2009-04-27

Maybe he thought "the ground" implied earth ground. BTW, what other alternative is there?

lemonie (author)2009-04-26

Giving the choices is part of it. Often when people know nothing about a subject they will quickly select an option if they are offered. It's a bit like "man-in-the-pub" - a person doesn't understand the conversation, but will pick a position they think is best in order to join-in. Don't give choices and the answers are different. L

flio191 (author)2009-04-26

true that. in a way it kinda observes how inefficient multiple choice questions can be

lemonie (author)2009-04-27

The problem with multi-guess tests is you would have to know the subject fairly well and deliberately try, in order to score nothing. Random blindfolded choices will count for something. That is unless, you score by knocking points off for wrong answers. L

whatsisface (author)2009-04-26

Fast Show at all?

lemonie (author)2009-04-26

Yes the Fast Show did exploit the classic man-in-the-pub situation. That wasn't specifically what I was thinking of but it comes from the same source, worthwhile reference. L

comodore (author)2009-04-27

eee I would say D and B... The two answers go together...

yourcat (author)2009-04-27

D and B.

Kiteman (author)2009-04-26

Good grief.

All modern education is getting utterly (censored).

Doctor What (author)2009-04-26

What's wrong kiteman? The modern day principle of "it's multiple choice or I'm confused as hell" got you down?

Kiteman (author)2009-04-27

>word<

The typical response to a question is "What page is the answer on?"

Doctor What (author)2009-04-26

Shout to the lady that the thieves are coming!

flio191 (author)2009-04-26

It's surprising to see what I thought were obvious answers aren't necessarily obvious or "common sense" to people who haven't really applied the information in their life.