Physics: Aperson travels by car from tucson to phoenix at a constant speed of 75 km/hr. they then return from phoenix to tucson at a constant speed of 65 km/hr. what was their average velocity?

Aperson travels by car from tucson to phoenix

Ответ:

mmaglaya1

04.01.2022

Physics

v=0

Explanation:

Knowing that the formula for average velocity is:

$v=\frac{x_{2}-x_{1}}{t_{2}-t_{1}}$

Being said that, we know that the person's displacement is zero because it returns to its starting point

$x_{2}=x_{1}$

That means $x_{2}-x_{1}=0$

$v=\frac{0}{t_{2}-t_{1}}=0$

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Ответ:

teddybear196510

07.06.2020

Physics

$\frac{AP_{B}}{AP_{S}} = 5.5* 10^4$

Explanation:

Basically, what the question wants to know is the ratio of Betelgeuse's apparent brightness to that of Sirius.

Apparent brightness (AB) is defined as a function of luminosity (L) and distance (d) as follows:

$AP=\frac{L}{4\pi d^2}$

Thefore, the ratio between both apparent brightnesses is:

$\frac{AP_{B}}{AP_{S}}=\frac{\frac{8.0*10^9}{4\pi 643^2}}{\frac{26}{4\pi 8.6^2}} \\\frac{AP_{B}}{AP_{S}}=\frac{8.0*10^9*8.6^2}{26*643^2} \\\frac{AP_{B}}{AP_{S}}=55,041.67\\\frac{AP_{B}}{AP_{S}} = 5.5* 10^4$

Betelgeuse supernova would be 5.5* 10^4 brighter in our sky than Sirius if it were to explode

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Aperson travels by car from tucson to phoenix at a constant speed of 75 km/hr. they then return from phoenix to tucson at a constant speed of 65 km/hr. what was their average velocity?

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