sjoel004

20.12.2019 • 

Physics

An object initially at rest falls from a height h until it reaches the ground. two of the following energy bar charts represent the kinetic energy k and gravitational potential energy ug of the object-earth system at two positions. the first position is when the object is initially released, and the second position is when the object is halfway between its release point and the ground. which two charts could represent the mechanical energy of the object-earth system? select two answers. by ug k ug к mechanical energy at halfway point mechanical energy at release point mechanical energy at release point mechanical energy at halfway point d. c. к ug ug k mechanical energy at release point mechanical energy at halfway point mechanical energy at release point mechanical energy at halfway point

Ответ:

ChaseRussell24

13.01.2022

Physics

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Initial:   bar  power U₀

Final:    bar  power U = U₀ / 2

             bar Kinetic energy  K = U₀ / 2

These two bars are half the height of the initial bar

Explanation:

To know which graph is correct, let's discuss the solution to the problem

Initial mechanical energy

      Em₀ = U₀ = m g H

The mechanical energy at the midpoint

     Em₂ = K + U₂

As there is no friction, mechanical energy is conserved

     Em₀ = Em₂

     U₀ = K + U₂

     K = U₀ - U₂

     K = m g (H - y₂)

Indicates that position 2 corresponds to y₂ = H / 2

     K = m g (H –H / 2)

     K = ½ m g H

     K = ½ Uo

Therefore the graph must be

Initial:   bar  power U₀

Final:    bar  power U = U₀ / 2

             bar Kinetic energy  K = U₀ / 2

These two bars are half the height of the initial bar

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Ответ:

Tweektweak

14.02.2020

Physics

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I am pretty sure it is electrons

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