Melody

921 Questions
34315 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
read more ..

Melody Apr 2, 2022

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Reporting problems.

There are a number of people having problems at the moment.
If you lodge an error can you please give all relevant information that you can think of.
Where you are in the world - the city or the country - is often very important information. read more ..

Melody Mar 16, 2022

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How to make an empty rectangle in Latex

I just worked out how to make an empty box of various horizonal size easily in LaTex.
This is not a recommended method, but other methods that I have tried here have not worked.
This coding is really simple. Just put letters inside read more ..

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Melody Mar 15, 2022

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HAPPY ANNIVERSARY CHRIS! (CPhill)

I just realized that you became a member here exactly 8 years ago today!

It has been great to have you here all that time

off-topic

Melody Mar 13, 2022

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WELCOME BACK CPHILL !

Melody Feb 11, 2022

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Very interesting question. No high level maths required.

This question was posted a couple of days ago.
https://web2.0calc.com/questions/geometry_73561

I think it is really interesting. It looks much more difficult than it really needs to be. read more ..

Melody Feb 1, 2022

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Members have a better experience. Their questions get more attention.

Almost everyone is posting as a guest.
If you post as a member your questions will have a far greater chance of a timely and helpful response.
If you are a genuine learner and interact with us, you will become known and answerers will do read more ..

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Melody Jan 9, 2022

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HAPPY BIRTHDAY CHRIS!

Melody Dec 20, 2021

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Some guidelines for question askers.

Please note:
1) Ask only one question per post.
2) When asking a question talk about what you have tried for yourself. Then people will take you more seriously and will be more able and willing to help.
3) If you get an answer read more ..

off-topic

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Melody Nov 4, 2021

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Remeniscing - a little historical humour.

I just found this old post that some of you, who have been around for a while, might find amusing.

https://web2.0calc.com/questions/look-at-the-new-leader-board

off-topic

Melody Oct 29, 2021

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2 m ³ = 2*100*100*100 = 2000000 = 2*10 ⁶ cm ³

10 ⁴ kg = 10 ⁴*1000 g = 10 ⁷ = 10000000 g

density = 10 ⁷ / 2*10 ⁶

density = 5 g/cm ³

Your first answer was correct.

You could say that density = 5*10 ⁰ but since 10 ⁰ is just 1 it is not needed.

density = 5 g/cm ³ is in scietntific notation just as is.

MelodyOct 12, 2013

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2^3+48x(-24)-(2+15x4)
8-1152-62
-1206

MelodyOct 12, 2013

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English transation

The official dealer in Russia ORTHOMOL

Taking this medication regularly, you can improve your health , boost immunity, help your body resist stress and excessive stress. Vitamins " Orthomol " : an individual approach to health like any other medication , vitamins " Orthomol " must be selected individually. Common vitamins universal family in a vial , usually do not have the proper effect on the organism . We offer to purchase vitamins " Orthomol " that will be fed individually for each member of your family and enrich the body with essential nutrients you can buy these vitamins for : · men · women · children.

Ok official dealer, now your ad is on the site in 2 languages. How about that.
Хорошо официального дилера, теперь ваши объявления на сайте на 2 языках. Как об этом.

MelodyOct 12, 2013

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Well, if it was solid it would have some bouancy because of its shape so I think it would tend to float.

I just did an experiment in my kitchen.
I filled up a jug with water,

then I filled up a little glass with water and dropped in a little food colouring.
You need very little food colouring to make the water go a rich colour.
so, I figure that the density of the coloured water must be almost identical to the density of the tap water.

Now I put just a drop of the coloured water into the jug.
It broke the water tension when it dropped, so it did go a little under the surface.
then it settled and stayed right where it started.
Eventually after a considerable period of time, it dispersed/disolved and became one with the water.

Anyway, my conclusion is that if there is no bouyancy effect than the introduced material would stay at the level where it started.

MelodyOct 12, 2013

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An investment of $1000 to double with an interest rate of 13% per year ???
Sorry, it doesn't make sense.

MelodyOct 12, 2013

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root66 can only be simplified is a square number goes onto 66
square numbers are 1,4,9,16,25,36,49,.......
do any of these square numbers go into 66?

MelodyOct 12, 2013

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I just fixed a couple of little typos in my answer.
It might make more sense now.

MelodyOct 11, 2013

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(3x to the power of 3)*(3x to the power of 4)*(-3xto the power of 2)=?

3x ³ * 3x ⁴ * -3x ²

=3*3*-3* x ³ * x ⁴ * x ²

= 3*3*-3* xxx * xxxx * xx

can you do it from here?

MelodyOct 11, 2013

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I just had a thought, bones are not solid.
Maybe old bones are hollow, I am not sure.
If 1.7 is the density of the bone part and does not include the middle then a full bone may well be able to float.

MelodyOct 11, 2013

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http://answers.yahoo.com/question/index?qid=20060610130653AAvt0DM

I googled it because I don't have a spare bone lying about to check for real. That is what the link above is.

The bone density is 1.7g/cm ³,
The water density is 1g/cm ³, (to 1 or even 2 significant figures : 0.99821)
the bone is quite a lot denser than water so normally I think it would sink.
It can only float is it is the right shape to promote bouyancy.
The articals I read said that human bones do float but I think they may have been refering to salt water which is denser.

MelodyOct 11, 2013