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Julli [10]
3 years ago
13

PLEASE HELP. I WILL MARK BRAINIEST

Physics
1 answer:
anyanavicka [17]3 years ago
6 0
Aaaaaaaaaaaaaaaaaaaaaaaa
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You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics
olga nikolaevna [1]

Answer:112.82 m/s

Explanation:

Given

range of arrow=68 m

Angle=3^{\circ}

as the arrow travels it acquire a vertical velocity v_y

v_y=u+at

v_y=0+9.81\times t-------1

Range is given by

R=ut

where u=initial velocity

68=u\times t

t=\frac{68}{u}

substitute the value of t in eqn 1

v_y=9.81\times \frac{68}{u}

v_y\times u=9.81\times 68=667.08--------2

and tan(3)=\frac{v_y}{u}

v_y=utan(3)=0.0524u

substitute it in 2

0.0524 u^2=667.08

u^2=12,728.644

u=112.82 m/s

6 0
3 years ago
(3)science who ever gets this right will get a brainlest
lara [203]

Answer:

True.

Explanation:

It also affects your lungs by getting lung disease.

3 0
3 years ago
What element has 3 valence electrons and 4 energy levels​
Tems11 [23]
Gallium is the answer
6 0
3 years ago
A 800hz tuning fork is vibrating, producing a sound wave in the air.
blsea [12.9K]

Answer:

The frequency of the sound wave is 800Hz

The speed of sound in a is about 340m/s.

Velocity = frequency x wavelength

making wavelength the subject formula

wavelength = Velocity/frequency.

wavelength = 340/800

wavelength = 0.425m.

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2 years ago
True or false? 1:The pH scale measures the concentration of hydroxide ions.
lukranit [14]
That would be false hope this helps
6 0
3 years ago
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