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

Properties of light, Properties of light: The wavefronts can be of dif...

Properties of light: The wavefronts can be of different shapes depending on the size and shape of light source and the distance from it. Huygens' principle states that every p

1 volt, 1 Volt : Potential difference among two points will be 1 volt i...

1 Volt : Potential difference among two points will be 1 volt if 1 joule of work is needed to move a +ve charge of Coulumb from 1 point to another.

Is a godd illuminator is bigger better, Is a godd illuminator is bigger bet...

Is a godd illuminator is bigger better? This is somehow surprising that manufacturers place huge emphasis in the power consumption, stating with a machine is 50, 100 or 400 Wat

Carbon composition variable resistor, MANUFACTURING: Two processes are use...

MANUFACTURING: Two processes are used manufacturing. Coated film: A mixture of carbon, filler and binder is coated on a ring of insulating material. The surface of the film is

Bulky group present at axial position , Why bulky group present at axial po...

Why bulky group present at axial position of chair or boat conformer is less stable compared to equitorial position?  Ans) Let the bulky group has a large mass M. suppose it is

What evidence suggests that light is a wave, 1. What evidence suggests that...

1. What evidence suggests that light is a wave? What evidence suggests that light is a particle? 2. In what sense does the "information age" depend on the bending of light?

Detremine the equivalent capacitance of the circuit, A 4μF capacitor is con...

A 4μF capacitor is connected in parallel with a 6μF capacitor. This arrangement is then linked in series with a 10μF capacitor. A supply p.d. of 250V is linked across the circ

Determine the north pole of a compass needle, The magnetic field of Earth r...

The magnetic field of Earth resembles the field of a bar magnet. The north pole of a compass needle, used for navigation, generally points toward the geographic north pole.

Max-well-ampere-s-law-4-quation , Normal 0 false false fal...

Normal 0 false false false EN-IN X-NONE X-NONE MicrosoftInternetExplorer4

Charge, can a charge by any means, today, travel from a source to a sink wi...

can a charge by any means, today, travel from a source to a sink wirelessly? Is there any technology to support it?

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