Measurement & Estimation: Fill & Download for Free

It measures how well you can do problems such as these…It will not tell you how well you can solve problems such as these…You’ve got 3 skinheads chasing you in a dark street in East London. What do you do?Your demanding manager insists you do something you know you can’t do. How do you handle this?You need to invest in one of these startups - Jibble or Bouncezap. Which one?Someone much stronger than you comes up to you and slaps you. How do you respond?

Q: If you don't believe in God because you can't see him, do you believe in the wind?A: This is an anemometer. It is used to measure wind speed.This is a weather vane. It is used to indicate wind direction.This is a pitot tube. It is used to measure air speed.This is a thermometer. It is used to measure the temperature of the air.This is a hygrometer. It is used to measure moisture in air.This is a barometer. It is used to measure air pressure.This is a flag flying in the wind.This is hair flying in the wind.This is lots of clouds driven by lots of wind.This is what lots of wind looks like on the ground.On top of all these indirect indications and measurements of wind, you can actually see and photograph wind.With what instruments can I measure gods, and how do I take a photo of one?

Before 1983, it was perfectly possible to measure the speed of light. It was measured countless times in hundreds of different ways, with varying degrees of accuracy.There was no technical reason it could not be measured. All you had to do was set up a precisely measured distance and precisely measure the time. The more precise your measurements, the better your answer.That all changed in 1983, when the General Conference on Weights and Measures (CGPM) redefined the meter as the length of the path travelled by light in vacuum during a time interval of [math]\frac {1}{299 792 458}[/math] of a second. That effectively defined the speed of light as 299 792 458 m/s, exactly—a defined constant.Now, you can say that although it is defined as a constant, it might be a little pointless to measure it any more, but hey, it couldn’t hurt to check it once in a while, right?Wrong. It is not only pointless to measure, but it has also become impossible to measure. How would you measure it? You can’t do it the old way, by a precisely measured distance and a precisely measured time. Because if you get any answer other than 299 792 458 m/s you have not measured the speed of light, you have proven that you didn’t precisely measure the length of the path, or that you didn’t precisely measure the time. The only possible right answer is 299 792 458 m/s.