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3 years ago

John stretched while his muscles were cold. Which negative effect could occur?

Physics

2 answers:

Ede4ka [16]3 years ago

5 0

Answer:

The answer for Plato is C.

Genrish500 [490]3 years ago

3 0

<h3><u>Answer;</u></h3>

C) He could injure or pull a muscle.

<h3><u>Explanation</u>;</h3>

<em><u>When muscles are stretched the muscle fibers are temporary lengthened. Muscles have a unique ability to undergo contraction and lengthening since they are elastic.</u></em>
<em><u>When the muscles are warm they are more elastic, therefore, warming up the muscles is very important for the purpose of avoiding injuries.</u></em> Ir is important to engage in moderate cardiovascular warm-up prior to stretching, which increases the blood flow to the active and thus avoiding injuries to the muscles.
Stretching muscles when they are cold may bring injuries or cause muscle pulls, which are painful.

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Answer:

Part a)

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Part b)

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Explanation:

As we know that by parallel axis theorem we will have

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Part a)

here we know that for a stick the moment of inertia for an axis passing through its COM is given as

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Part b)

here we know that for a cube the moment of inertia for an axis passing through its COM is given as

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now if we need to find the inertia about an axis passing through its edge

$I_{edge} = I_{cm} + Md^2$

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3 years ago

A boy is playing with a ball of mass 72g attached to a string. He is moving it at constant speed in a horizontal circle of radiu

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Answer:

Explanation:

radius of circle r = 0.9 m.

(a ) In a motion on circular path , work done is zero because force ( centripetal force ) acts perpendicular to displacement .

( b )

Tension in string T = m ω²r

Putting the values

60 = .072 x ω² x 0.9

ω² = 926

ω = 30.4 rad /s

angle made in 20 revolutions θ = 20 x 2π = 126.6 rad

time taken = θ / ω

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= 4.16 s .

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How to solve the problem

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Answer:

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Explanation:

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The elasticity of demand measures the reaction of demand when one of the factors that affects it varies.

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