3 years ago

What are the answers to the question

Physics

1 answer:

Vitek1552 [10]3 years ago

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Answer: the link isnt loading

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a plane is flying 120 m above the ground at an angle of 30 degrees to the horizontal, when the pilot released 2 fuel tanks to de

charle [14.2K]

Answer:

2.26 seconds

97m/s

Explanation:

1. Fall time

i) Find the vertical speed of the plane when the tanks were released

$V_{y,0}=84m/s\times sin(30\º)=42m/s$

That is the same initial vertical speed of the tanks.

ii) Find the fall time

$y-y_0=V_{y,0}\cdot t+g\cdot t^2/2$

$120=42t+4.9t^2$

$4.9t^2+42t-120=0$

$t=\dfrac{-42\pm\sqrt{(42)^2-4(4.9)(-120)}}{2\times 4.9}$

Only the positive value has aphysical meaning: t = 2.26 seconds.

2. Speed when they hit the ground

i) The horizontal speed is constant:

$V_x=84m/s\times cos(30\º)\approx72.5m/s$

ii) The vertical speed is:

$V_y=V_{y,0}+g\cdot t$

$V_y=42m/s+9.8m/s^2\cdot (2.26s)\approx64.1m/s$

iii) Total speed

$V=\sqrt{V_x^2+V_y^2}$

$V=\sqrt{(72.5m/s)^2+(64.1m/s)^2}\approx97m/s$

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T=0-15.5/-0.392
=39.5m/s

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An oil droplet is levitated and held at rest in a region where the electric field is 1.4x104 N/C directed vertically downwards.

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W = q E

m = q E / g = = 3 e E / g

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What needs to be done to this circuit so that the light bulb lights up?

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