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  #1801  
Old 16.04.2018, 15:55
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Re: Ask a Scientist

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fill the cup to the brim and weigh it =m1
put the ball in the cup and so let some water out, ensure the ball is completely under water.
get the ball out without losing any more water
weigh the cup again = m2
and calculate the weight of water lost m3 =m1 - m2
weigh the ball alone = m4

Density = m4/m3

now weigh the cup again and calcuate the weight of water lost
That's the messy way, but nowhere near as elegant as the old fashioned way.
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  #1802  
Old 16.04.2018, 15:57
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Re: Ask a Scientist

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That's the messy way, but nowhere near as elegant as the old fashioned way.
You did not write it was a balance scale?
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  #1803  
Old 16.04.2018, 15:58
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Re: Ask a Scientist

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No but Archimedes did
lol...screwed! I think i might be starting to come down with..what's it called again?

thanks for the clarification.
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  #1804  
Old 16.04.2018, 16:00
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Re: Ask a Scientist

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You did not write it was a balance scale?
It can be a balance or a platform scale, or even a suspension scale (like fishermen use, but accurate).
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  #1805  
Old 16.04.2018, 16:18
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Re: Ask a Scientist

Good luck to the rest of you attempting solutions! I think that most of my group would struggle to even remeber enough to understand Jag's question.
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  #1806  
Old 16.04.2018, 18:20
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Re: Ask a Scientist

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lol...screwed! I think i might be starting to come down with..what's it called again?

thanks for the clarification.
It is called "Alice" as in
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They're changing guard at Buckingham Palace -
Christopher Robin went down with Alice.
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  #1807  
Old 16.04.2018, 19:44
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Re: Ask a Scientist

Not sure if this is a trick question. Fill jug. Weigh (m1). Drop ball in water. Weigh again(m2). Remove ball. weigh again (m3).

M1-M3 = mass of water displaced. Md
M2-M3 = mass of ball. Mb

Density of ball = Mb/Md. (g/cc, assuming pure water at STP).
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  #1808  
Old 16.04.2018, 19:54
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Re: Ask a Scientist

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Not sure if this is a trick question. Fill jug. Weigh (m1). Drop ball in water. Weigh again(m2). Remove ball. weigh again (m3).

M1-M3 = mass of water displaced. Md
M2-M3 = mass of ball. Mb

Density of ball = Mb/Md. (g/cc, assuming pure water at STP).
If you had scales, wouldn't you just weight the ball directly?
And use the jug+water to measure the increase in volume?

This gives you the 2 inputs into density, mass/volume
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  #1809  
Old 19.05.2018, 13:55
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Re: Ask a Scientist

Why does the limestone stick only to the hot-pipe of the bath-tub tap and not to the cold?

It's not that limestone generally does not stick to cold-water-pipes.
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  #1810  
Old 19.05.2018, 14:08
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Re: Ask a Scientist

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Why does the limestone stick only to the hot-pipe of the bath-tub tap and not to the cold?

It's not that limestone generally does not stick to cold-water-pipes.
Wikipedia does a decent job of explaining it - https://en.m.wikipedia.org/wiki/Limescale
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  #1811  
Old 19.05.2018, 14:25
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Re: Ask a Scientist

Thank you
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  #1812  
Old 09.06.2018, 19:19
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Re: Ask a Scientist

Almost daily I have these wasps crawling about the patio. They can't fly.
Some are very lethargic, others crawl actively all over the place.
There is no nest near by. It's about one or two wasps a day. No it's not the same one as they are different sizes (different breeds, I suppose) but all from the "wasp-family" (not bees).

What could be wrong with them?
I tried googling, to no avail.
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  #1813  
Old 29.06.2018, 14:10
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Re: Ask a Scientist

Does anybody wonder why several volcanos are active at the same time?
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  #1814  
Old 29.06.2018, 14:22
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Re: Ask a Scientist

I assume because one sets off another further down the chain, particularly in the Pacific Rim. The earth's plates are shifting all the time so not really surprising more than one volcano is active.

https://en.wikipedia.org/wiki/Volcan...oes_map-en.svg

https://en.wikipedia.org/wiki/Volcano#Plate_tectonics
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  #1815  
Old 09.08.2018, 20:24
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Re: Ask a Scientist

What is the physical difference between sweet potatos and "normal" ones?

I've stored some sweet potatos in the cupboard for about a month now and they look happy, hard, no color change, no consistency change. No change in taste. They made a few very thin but kind of long roots, which are easily removed. Interesting enough only from one spot.
I've had the other potatos for about 10 days, they are shrimpled, ugly, soft and not appealing. And roots all over.

Sweet potatos seem dryer when you peel them. They are a lot wetter than the others once cooked.
Is it the starch? Do the sweet ones have less? Does starch age things?
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  #1816  
Old 09.08.2018, 22:07
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Re: Ask a Scientist

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What is the physical difference between sweet potatos and "normal" ones?

I've stored some sweet potatos in the cupboard for about a month now and they look happy, hard, no color change, no consistency change. No change in taste. They made a few very thin but kind of long roots, which are easily removed. Interesting enough only from one spot.
I've had the other potatos for about 10 days, they are shrimpled, ugly, soft and not appealing. And roots all over.

Sweet potatos seem dryer when you peel them. They are a lot wetter than the others once cooked.
Is it the starch? Do the sweet ones have less? Does starch age things?
Poor curley, is the heat getting to you? I refer you to posts 1770, 1771, 1772, and 1775 of this very thread.

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Sweet potatoes and "regular" potatoes aren't that closely related. Sweet potatoes are root tubers, and regular potatoes are stem tubers. Google that for some fun reading.
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Which is scientist speak for "they make babies differently".
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Don't really want to know about their baby-making. I want to keep them from aging within days.

But 3wishes just sent me googling - not even providing the link that gets me straight to where I need to. And I'm just too tired for that now.
And let's face it: Would I have asked here if I wanted to go find out myself?
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Sorry, dinner was on the table and Mr Wishes was getting grumpy, so you got a really quick reply....
Sweet potatoes have slightly more starch than regular potatoes, but I'm pretty sure the spoiling vs. not has more to do with the dormancy period of each type of tuber, and how they are being stored.

More reading for you with loads of comparisons between the two. https://www.precisionnutrition.com/r...sweet-potatoes

Last edited by 3Wishes; 09.08.2018 at 22:31. Reason: added another sentence and some emojis
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  #1817  
Old 09.08.2018, 23:46
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Re: Ask a Scientist

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Poor curley, is the heat getting to you? I refer you to posts 1770, 1771, 1772, and 1775 of this very thread.
Oh dear
Let's hope it's the heat and not alzheimer, eih? If it's the latter, can we make a deal you just secretly delete my double posts the next 50 years?

Can anyone tell I had to get potatos out today?
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  #1818  
Old 10.08.2018, 00:15
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Re: Ask a Scientist

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Sweet potatos seem dryer when you peel them.
Whyever would you peel them?
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  #1819  
Old 10.08.2018, 00:21
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Re: Ask a Scientist

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Whyever would you peel them?
Good question. I usually don't. But I did last time as I wanted to mash them after and I guess I just did "the usual thing" when making mash.

You know, this alzheimer-thing that seems to hit me every time potatos are involved.
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  #1820  
Old 24.08.2018, 09:12
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Re: Ask a Scientist

I've been refered to a chiropractor and wonder if this is orthodox medical treatment or some alternative therapy that has questionable worth. I was happy to rest and medicate with anti-inflammatories (which was one of the options put forward), but advised that a chiropractor would give quicker results. One visit in and I'm loathe to return. It was pain like I've never experienced before.

What's the general verdict from science professionals on the matter please?
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