Transform kinetic energy into vertical potential energy, Physics

Assignment Help:

Transform kinetic energy into vertical potential energy

A pole vaulter performs the extraordinary feat of converting his forward kinetic energy to vertical potential energy. Using this information we are able to estimate the maximum height possible for a pole vault. We assume not quite correctly that the pole itself can't store and release energy during the vault. As well assume that the conversion is lossless.

Assume the vaulter can run at 20.5 mph. This is about 30 fps Then his kinetic energy at the start of the vault is KE = mv2 /2 = 450m. His potential energy at the top of the vault is PE = mgh = 32mh. So

h = 450/32 ft = 14 ft.

However this height refers to the height of the center of gravity of the vaulter. At the begining of the vault his center of gravity is about 3.5 ft above the ground. When he clears the bar it is about 5 in = 0.41 ft above the bar. Therefore the maximum height of the bar must be 3.5 + 14 - 0.41 ft = 17.1 ft above the ground.

This height was in fact reached during the 1960s and established a world record at the time. By 1991 the record had ascended to over 20 ft a height which was achieved by Ukranian athlete, Sergei Bubka. The enhanced heights are largely due to improvements in the pole which allow the vaulter to store energy in the pole by flexing it just before the jump. This energy is returned during the jump to contribute to the largely height. It is clear a taller pole vaulter has an advantage over his shorter competitors by the increased height of his center of gravity. Conceivably in the future a handicap system would be appropriate.


Related Discussions:- Transform kinetic energy into vertical potential energy

How do you separate hydrogen and oxygen gases, How do you separate Hydrogen...

How do you separate Hydrogen and Oxygen gases in industrial electrolysis of water process? In electrolysis, oxygen and hydrogen gas are formed at dissimilar electrodes (oxygen

Bcs throry, bcs theory of superconductivity.

bcs theory of superconductivity.

Why does a glass filled with water smash, Q. Why does a glass filled with w...

Q. Why does a glass filled with water smash when you run your finger along the rim of the glass? Answer:- A portion of crystal stemware has a natural or resonant frequency

Define current density, Q. Define: current density. Give its unit. The ...

Q. Define: current density. Give its unit. The amount of charge passing per unit time through unit area taken perpendicular to the direction of flow of charge at that point is

Electric, Find the electric field between the plates of a capacitor given t...

Find the electric field between the plates of a capacitor given the following:? (1) C= 10pF (2) the capacitor is connected to a 25 V battery (3) there is a vacuum between the capa

Eddt current, why a metal disc is thrown up when it is placed on the top of...

why a metal disc is thrown up when it is placed on the top of an electromagnet is the current is switched on?

Calculate the velocity of top of the 12m tall hill, A sled and its rider, w...

A sled and its rider, with a total mass of 95 kg, are perched on top of a 25-m-tall hill. A second hill is 12 m tall (see the diagram below). The rider is given an initial push

Maxwells electromagnetic equation, Starting from Maxwell's electromagnetic ...

Starting from Maxwell's electromagnetic equation in free space, Get Poynting theorem.

Verify the principle of potentiometer, Verify the principle of potentiomete...

Verify the principle of potentiometer. Illustrate a circuit diagram used to compare the e.m.f. of two primary cells. Write the formula used. How can the sensitivity of a potentiome

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd