Which of the following examples illustrates static friction in action?

Physics

2 answers:

Slav-nsk [51]3 years ago

7 0

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

<em>D. a car starting to move after the light changes from red to green</em>

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

<u><em>Static friction</em></u> is a type of friction or a force that is experienced by a body or a substance at rest. Therefore, when a force is applied on a body or an object at rest it opposes the static friction.
<em><u>Static friction </u></em>does not have the ability to move an object or induce motion since it is countered by other strong opposite forces. Static friction must be overcome to cause motion of the object.
When a <em><u>body or an object is in motion it experiences kinetic friction</u></em>. Therefore, when a body at rest starts to move then the friction changes to kinetic friction.

lilavasa [31]3 years ago

3 0

I think its d. but im not sure

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Answer:

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denis23 [38]

Answer:

at resonance impedence is equal to resistance and quality factor is dependent on R L AND C all

Explanation:

we know that for series RLC circuit impedance is given by

$Z=\sqrt{R^2+\left ( X_L-X_C \}right )^2$

but we know that at resonance $X_L=X_C$

putting $X_L=X_C$ in impedance formula , impedance will become

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now quality factor of series resonance is given by

$Q=\frac{\omega L}{R}=\frac{1}{\omega CR}=\frac{1}{R}\sqrt{\frac{L}{C}}$ so from given expression it is clear that quality factor depends on R L and C