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skad [1K]
3 years ago
15

Which constellation is only visible during summer in Northern Hemisphere? A. Leo B. Taurus C. Cygnus D. Cassiopeia

Physics
1 answer:
Alex73 [517]3 years ago
8 0

Answer:

C) Cygnus

Explanation:

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You are riding a broomstick and see a golden ball hovering motionless 30 meters directly in front
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You should fly at an angle of 14.0^{\circ}

Explanation:

The motion of the ball is a free fall motion, so the vertical displacement of the ball (in negative directions) is given by

y=\frac{1}{2}gt^2

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t is the time

The horizontal distance you have to cover to catch the ball is

x = 30 m=d

The vertical and horizontal displacement form a right triangle, so that we can write

tan \theta = \frac{y}{x}

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tan \theta = \frac{gt^2}{2d} (1)

We also know that the horizontal position of the person at time t is

x(t) = v cos \theta t

And so, for the time t at which the person catches the ball,

d=v cos \theta t\\t=\frac{d}{v cos \theta}\\t^2=\frac{d^2}{v^2 cos^2 \theta}

Substituting this expression into (1),

tan \theta = \frac{g}{2d} \frac{d^2}{v^2 cos^2 \theta}\\2 tan \theta cos^2 \theta = \frac{gd}{2v^2}

And using

tan \theta = \frac{sin \theta}{cos \theta}, 2sin \theta cos \theta = sin(2\theta)

we find:

sin (2\theta) = \frac{gd}{v^2}=\frac{(9.8)(30)}{25^2}=0.470\\2\theta = sin^{-1}(0.470)=28.0^{\circ}\\\theta=\frac{28}{2}=14.0^{\circ}

Learn more about free fall motion:

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brainly.com/question/11042118

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#LearnwithBrainly

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which organelle in the plant cell would mainly help the cell tack in water or get rid of water just like the potato did? this is
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cell membrane;cellular respiration
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A 40kg rock falls off a cliff that is 50 meters high. How fast is the speed of the rock when it hits the ground.
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