A1. Please give detailed answer. Thanks. In a video clip, a man is bound by chains and ishanging from the top and rotating on the chain. Inthe end of the clip, the man says "I am not evenmoving, it's doing this on its own."This is due toconservation of massconservation of momentumconservation of energyconservation of angular momentummagic

Answered: In a video clip, a man is bound by…

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter13: Rotation Ii: A Conservation Approach

Section: Chapter Questions

Problem 47PQ

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A1. Please give detailed answer. Thanks.

In a video clip, a man is bound by chains and is
hanging from the top and rotating on the chain. In
the end of the clip, the man says "I am not even
moving, it's doing this on its own."
This is due to
conservation of mass
conservation of momentum
conservation of energy
conservation of angular momentum
magic

Expert Solution

Step 1

Scenario:

A man is hanging from the top and bounded by a chain such that man is rotating on the chain.

Let's find why the man said "I'm not even moving, it's doing on it's own" at the end.

Step 2

By $\vec{L}$ conservation :

We know,

Total $L (a n g u l a r m o m e n t u m)$ of system is conserved if net torque is zero.

Therefore, In this scenario, a man is rotating about its axis and rotating across the chain and thus no external torque is experienced by man. Consequently, chain is rotating in its own to conserve the $L$ of the system.

Mathematically,

$L = I ω = r \times p$

here,

$τ = 0 \Rightarrow τ = \frac{d L}{d t} = 0 \Rightarrow L = c o n s t a n t$

Thus, option(d) is correct.

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