3 years ago

Which change of state has the wrong energy change listed? condensation deposition melting freezing

Physics

2 answers:

ipn [44]3 years ago

6 0

Where are the energy changes?

REY [17]3 years ago

5 0

It's deposition so be. It should say deposition gains when it actually loses energy.

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What percentage of the takeoff velocity did the plane gain when it reached the midpoint of the runway? a plane accelerates from

ElenaW [278]

When is at the end of the runway the velocity of the plane is given by the equation $vf^{2}=0+2*a*s$ where s=1800 m is the runway length. Thus
$vf^{2}=2*5*1800=18000 (m/s)^{2}$
$vf =134.164 (m/s)$

At half runway the velocity of the plane is
$v^{2}=2*5* \frac{1800}{2}=9000 ( \frac{m}{s} )^{2}
$
$v= \sqrt{9000}=94.87 ( \frac{m}{s})$

Therefore at midpoint of runway the percentage of takeoff velocity is
‰ $P= \frac{v}{vf}= \frac{94.87}{134.164}=0.707$

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3 years ago

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Temka [501]

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3 years ago

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Lesechka [4]

I'm Pretty sure it's FRICTION

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