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...T boundary). By dating rocks we have been able to match up this event with the impact of a large meteorite off the Yucatan coast of Mexico, and with the eruption of vast lava flows in India. Both of these events caused a catastrophic change in the climate and environment, and that was the end of the dinosaurs! Radiometric dating has given us an age for this of - 66...

...t Equation label: (Equation 11) where u sub map is the wind speed, c sub alt is the altitude coefficient, c sub dir is the direction coefficient, c sub e is the exposure coefficient and c sub e comma cap t is a town location coefficient. Equation 11 is basically the equation for dynamic pressure in air of density rho = 1.225 kg m−3 i.e. equation sequence part 1 cap p...

...t equals L divided by V] where t is the time lag we want to find and V is the speed. The speed we need is the speed at the centre of the pendulum’s motion. To perform that calculation, all we need to do is find the value of V. That is something that can be calculated from the dimensions of your pendulum (you will remember measuring its length and how far you pulled it...