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Galileo's invention of the lens telescope Newton's discovery of the laws of motion and his invention of the reflecting telescope. Hubble's discovery of galaxies to name but 3 of thousands.

Op amps can be connected as either an inverting or non-inverting amplifier. The gain is the output/input amplification factor. The inverting gain is -R2/R1 where R2 is the feed back resistor and R1 is the input resistor so if R1 = 100 ohms and R2 = 1k ohms gain = - 10 . the negative sign means...

They do take time and I get very depressed by the deforestation of the Amazon - but I did see a report earlier this year that showed a large area (several suare miles) that had been burned down for planting crops 25 years ago and then had been left when the company went bust - it showed it now...

20 - A - the ocean - far more energy because of the huge mass 24 - B . temp increaseswont necessarily change state unless it is close to boiling already and it will already be losing heat to its surroundings assuming it was hotter to start with 25 A .- increases - would only remain the same if...

The force depends on the momentum ( mass x velocity) . Momentum depends on the mass The bus has more mass therefore more momentum - therefore takes more force/energy to stop.

Power is the rate of doing work = work /time = joules per second Assuming no loss due to efficiency motor will do 14kj of work per second weight = mass x gfs gfs is approx 10N/kg weight of lift = 11000N = 11kN force acting down work = force x distance lift can travel a distance of work/force =...

That's what makes it interesting - just when you think you have got everything sussed along comes something else to amaze you.