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shusha [124]
3 years ago
15

jamal wanted only to test the effect of the free fall and so he put his system in a vacuum to prevent air resistance. In free fa

ll, will the crumpled or flat paper reach the ground first?
Physics
2 answers:
Elis [28]3 years ago
8 0

Explanation :

It is given that, Jamal wanted only to test the effect of the free fall and so he put his system in a vacuum to prevent air resistance.

Vacuum is also called as free space. In a vacuum there is no air resistance. We know that the air resistance depends on surface area.

But in the vacuum there is is no resistive force. So, in free fall both crumpled or flat paper will reach the ground at the same time.

Alborosie3 years ago
6 0

Both papers will reach the ground at the same time. CORRECT ANSWER

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Incomplete question.The Complete question is here

A flat uniform circular disk (radius = 2.00 m, mass = 1.00 ✕ 102 kg) is initially stationary. The disk is free to rotate in the horizontal plane about a friction less axis perpendicular to the center of the disk. A 40.0-kg person, standing 1.25 m from the axis, begins to run on the disk in a circular path and has a tangential speed of 2.00 m/s relative to the ground.

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(a)ω = 1 rad/s

(b)t = 2.41 s

Explanation:

(a) initial angular momentum = final angular momentum  

0 = L for disk + L............... for runner

0 = Iω² - mv²r ...................they're opposite in direction

0 = (MR²/2)(ω²) - mv²r ................where is ω is angular speed which is required in part (a) of question

0 = [(1.00×10²kg)(2.00 m)² / 2](ω²) - (40.0 kg)(2.00 m/s)²(1.25 m)

0=200ω²-200

200=200ω²

ω = 1 rad/s

b.)

lets assume the "starting point" is a point marked on the disk.

The person's angular speed is  

v/r = (2.00 m/s) / (1.25 m) = 1.6 rad/s

As the person and the disk are moving in opposite directions, the person will run part of a revolution and the turning disk would complete the whole revolution.

(angle) + (angle disk turns) = 2π

(1.6 rad/s)(t) + ωt = 2π

t[1.6 rad/s + 1 rad/s] = 2π

t = 2.41 s

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