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High jumpers usually sustain fractures in the lower third of the fibula. The world record for the high jump is held by Javier Sotomayor (Cuba) at 2.45 m (1993). If he weighed 68 kg could muster a run-up speed of 9 m s-1, had a center of mass which was 1.2 m of the floor and took 0.3 s to push off from the floor then calculate the stress in his fibula. Note that during the Fosbury Flop the higher jumper pushes of from the ground using both feet, the cross-sectional area of the fibula is 1 cm2 , and that the fibula plays a minor role in weight-bearing with the tibia supporting approximately 95% of the weight. Stress is defined as force per unit area. i. In order for Javier to make the jump how much energy does he need? Note he only has to raise his center of mass to 2.45 m from 1.2 m. ii. By balancing potential energy and kinetic energy, how much velocity does he need? iii. Given that it took an estimated 0.3 s for this velocity to be acquired, what was his acceleration and what is the force required to generate this acceleration. iv. If the fibula only provides 5% of this force then how much force is that? And given the definition of stress, what is the stress in the fibula?
The blue line of the hydrogen emission spectrum has a wavelength of 433.9 nm. Calculate the energy of one photon of this light
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Physics - Speed and Direction, Driving along a crowded freeway, you notice that it takes a time t to go from one mile marker to the next.
The student realizes that the spring demonstrates SHM with the attached mass of 255.0 g. The student is next asked to calculate the period of oscillation, T
A hurricane wind blows across a 7.50m × 16.4m flat roof at a speed of 180km/hr, How much force is exerted on the roof
Water flows through a horizontal tube of diameter 3.0 m that is joined to a second horizontal tube of diameter 2.2 . The pressure difference between the tubes is 8.0 kpa . Find out the speed of flow in the first tube.
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