Science

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physics -using sound to calculate depth

you toss a stone into a well and hear a splash in 2.5 seconds. the speed of sound is 340 meters/second. how deep is the well?

Lovinit

Chemical element

Can anyone tell me which chemical element is named after Copenhagan?

fly258

Bathroom scales

Why do they give a different reading when used on a hard or a soft surface?

Brain waves

Does anyone know where the alpha, beta, theta and delta waves in the brain emanate from?

soozmac

working out percentages

hello all. how can I work out the starting amount if I have the final gross total and the vat percentage? For example, if I know that a net amount is 3894.86 and there is vat of 16% which is 741.88,...

Bloody Transfusions and DNA

Ok, we all know that DNA is unique to each individual. Say for instance someone needed a blood transfusion, would they then have the DNA of the person the blood came from? Or if there is a mixed blood...

3-fingered humans

I remember seeing an article some time ago about the population in an African village who have evolved having two fingers and a thumb on each hand. Was this a fact or a hoax.

stars twinkiling

why do stars appear to twinkle? (i know lot of the time when we see them, they no longer exist) but why do they only appear at night sometimes - even when its doesn't seem couldy?

Roden

% uncertainty

How do i calculate the % uncertainty for example of a Voltmetre I have a set of results for resistance in a wire, and the voltage alters from 1.17v to 1.47v Do i need to work out the % uncertaincy for...

Incinerator costs

how much would it cost to construct an incinerator that is capable of handaling 500000 tonnes a year, also how much would the matiance cost, oh yerh how meany ppl are needed to operate the macheary...

Power and Resistance

How does power affect the resistance of a circuit containing a bulb, using an LDR as a measuring source?

August Bank Holiday

Is the August Bank Holiday (the 2nd if you're lucky enough to work in Scotland) officially the last Monday in August?

melting ice

I have just frozen some water in a jar and marked the level of the ice in the jar, then I let the ice melt and the level has gone down showing that ice takes up a larger area than water. Bearing this...

Litres and Tonnes

Can anyone tell me how many litres of diesel there are in a tonne? I know it varies with conditions but a rule of thumb would be helpful!

djab911

Cupronickel

Can anyone please tell me if cupronickel is a soft or hard metal ?

diudiu

Nerve cells

name two characteristics of the nerve cell that differ it from the other types of cells in the human body.

freezing water bottle

I was making coffee this morning. I pulled some high quality Kirkland bottled water from the garage to use for the coffee. The water in the bottle was not frozen - or even slushy. However, when I...

asbestos

why doesn't asbestos conduct heat?

Dimmer switch

hwo could you make a dimmer switch at home ?

Tides

During a high tide, is water flowing uphill?

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