As we all know, in school we are taught gravity IS a force. However, the truth is that according to the theory of general relativity gravity is NOT a force, rather a curvature in spacetime. Can...
An infinite number of points A are placed at random on an infinitely long line. A second infinity of points B are also placed at random on the line. How many B's coincide with one or more A's on...
The high-power pumps can empty the reservoir in four months and consume large amounts of energy. A hundred pipes could empty it quicker and cost little.
Is anyone else irritated by not knowing in The Planets series which scenes are real and which are computer-generated. It would be easy to include an on-screen symbol to tell us which. Wildlife and...
Just watched episode 1 (of five) covering the formation of the terrestrial planets.
Nice stuff.
If you hadn't clocked the series it's on BBC2 and available on IPlayer....
Ducks fly in V-formation to save energy. When swimming, should the V be sharper or flatter? Does it depend on viscosity, or speed of sound in the medium, or both?
ABCD is a trapesium with AB parallel to DC - the diagnonals meet at X - prove DXC and BXA are similar traingles and that area of DXC = DC2 ---------------- ------ araa of AXB AB2 Answer - the similar...
How do Black Holes swallow matter? They have high gravity, but almost every object that approaches them should go into orbit in the same way that almost everything in the Solar System orbits the Sun....
If I receive income on Tuesday and give some to my son on Thursday, he never has to pay tax on it even if I die within seven years. If I wait twenty years to give it, it then becomes savings, and he...
I'd like to know what £1000 20 years ago would be equivalent to today. I've been online, of course, but the calculators don't give me what I want to know. To be clear, what I want to know is the...
My family has inherited a quite large sum of money from my late Mum. I'm thinking of putting it in a decent interest bank account until we are in a position to share it out. Any suggestions please?...
Mentioned to someone that the public swimming pool was cool. Was told by staff that it was cooler because lots of school children had just had a session in it.
Is this scientifically correct?...
I put 2 beakers on a balance one contained 20cm cubed of hydrochloric acid 20cm cubed of sodium hydroxide solution. The total mass was 163.5 she poured the acid onto the sodium hydroxide .Why did the...
