Physics: If the radius of a coinis 20cm, find itssurface area -

25.52 secondsExplanation:Speed of space ship = 0.92 c = vc = Speed of lightTime observed from asteroid = Δt = 10 secondsTime dilation ∴ Time interval be if measured by an observer on the Enterprise would be 25.52 seconds...

If the radius of a coinis 20cm, find itssurface

Ответ:

samy14

07.02.2022

Physics

800 $\pi$ cm²

Explanation:

Given parameters:

radius of the coin = 20cm

Unknown:

Surface area of the coin = ?

Solution:

A coin is made up of two faces;

Surface area = 2(πr²)

Insert the parameters and solve;

Surface area = 2( $\pi x 20^{2}$ )

Surface area = 800 $\pi$ cm²

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Ответ:

Ailany972

28.04.2022

Physics

25.52 seconds

Explanation:

Speed of space ship = 0.92 c = v

c = Speed of light

Time observed from asteroid = Δt = 10 seconds

Time dilation

$\Delta t'=\frac{\Delta t}{\sqrt{1-\frac {v^2}{c^2}}}\\\Rightarrow \Delta t'=\frac{10}{\sqrt{1-\frac {0.92^2c^2}{c^2}}}\\\Rightarrow \Delta t'=\frac{10}{\sqrt{1-0.92^2}}\\\Rightarrow \Delta t'=25.52\ s$

∴ Time interval be if measured by an observer on the Enterprise would be 25.52 seconds

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If the radius of a coinis 20cm, find its
surface area -

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