Melody

921 Questions
34316 Answers

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Mathigon website

I just discovered a site called mathigon

https://mathigon.org/dashboard
lire plus ..

Melody 2 avr. 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. lire plus ..

Melody 16 mars 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 lire plus ..

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Melody 15 mars 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

Hors sujet

Melody 13 mars 2022

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WELCOME BACK CPHILL !

Melody 11 févr. 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. lire plus ..

Melody 1 févr. 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 lire plus ..

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Melody 9 janv. 2022

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HAPPY BIRTHDAY CHRIS!

Melody 20 déc. 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 lire plus ..

Hors sujet

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Melody 4 nov. 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

Hors sujet

Melody 29 oct. 2021

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http://www.mymathforum.com/index.php

I can't answer this, if I could, I would.
If you do not get an answer soon you may consider posting your question in the forum above.
I think you will be more likely to get an answer there.
There is a section there specifically for physics and chemistry questions.

Melody24 oct. 2013

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It's not your question dedwe, so why does it help you?

sqrt257 to the 3rd power = (257^1/2) ^(1/3) = 257 ^ (1/6) = approx 2.52147996

Melody24 oct. 2013

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You just graph each one separately and the answer is where they cross.

These 2 are both lines so if the gradients are the same they will be parallel and never cross
If one equation is a multiple of the other
eg 3x-2y=7 and 6x-4y=14 then they are the same line and there will be an infinite number of solutions.
Otherwise there will be 1 solution where they cross.

Melody24 oct. 2013

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With substitution

Melody24 oct. 2013

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a 60 kg student is standing on a bathroom scale in the elevator. Of course the scale measures weight in newtons.
I am not sure about this topic so I posted your question on mymathforum.com

http://www.mymathforum.com/viewtopic.php?f=13&t=43715&p=183412#p183412

and this was the answer I was given. It makes sense to me.

When he is not in an elevator his weight will be 60g newtons

calculate the reading of the scale if, the elevator is moving at a constant speed, Still 60g newtons

the elevator is accelerating 4m/s/\2 up, 60(g+4) newtons

4m/s/\2 down 60(g-4) newtons

and finally the cord is cut and in free fall 60(g-g) = 0

Melody24 oct. 2013

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Maybe, but how do we know that you really are 'the real batman'? You might be the Joker in disguise!

Melody24 oct. 2013

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You have to make the denominators (bottoms) the same first. Then you just subtract the tops and leave the bottom alone.

example
1/2 - 1/4 = 2/4 - 1/4 = (2-1)/4 = 1/4

Melody24 oct. 2013

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Okay,
I've had a think a and a chat to another and I can account for at least some of the error in my second method solution.

First I should have had the external height as 17.00001m
and
secondly the external radius will be bigger than 100.00001m because the cone comes down at an angle. That is, the angle between the base and the side of the cone is not 90 degrees so this gives a trapezoidal shape at the end of the cloth. It is not the end of a rectangle.
These 2 factors together may be enough to account for the difference in volume.

The first answer is definitely the best one.

Now I think I am happy

Melody24 oct. 2013

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I don't understand your question.

Melody24 oct. 2013

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is 1.6 more or less than 0.25

One of them is more than 1 and the other is less than 1. Can you guess which is which?

Another hint:
If you have $4.75 that is 4.75 dollars.
How many whole dollars do you have.

Another hint:
which is more
$1.60 or $0.25

Melody24 oct. 2013