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Ratling [72]
3 years ago
9

Sound is repeated near hills....Why??? ​

Physics
1 answer:
madam [21]3 years ago
5 0

Answer:

because there is many places for it to bounce of of creating another soundwave

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PLZ HELP ME NOW PLZ I NEED THE ANSWER NOW. which statement describes the correct charges of subatomic particles?
Lapatulllka [165]
Are there choices that come with this question?

6 0
3 years ago
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Why do electrical devices have resistance​
Kamila [148]
As electrons move through the conductor, some collide with atoms, other electrons, or impurities in the metal.
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3 years ago
A 3.53-g sample of aluminum completely reacts with oxygen to form 6.67 g of aluminum oxide. find percent composition
katrin2010 [14]

The mass percent composition of aluminum is 52.9% in aluminum oxide.

Mass of the aluminum = 3.53 g

Mass of the aluminum oxide = 6.67 g.

The mass percent of a substance is the mass of the substance divided by the mass of the compound into 100.

Aluminum reacts with oxygen to form aluminum oxide.

The overall balanced equation for the reaction is,

Aluminum + Oxygen→Aluminum \: oxygen

4Al +3O _{2}→2Al _{2}O _{3}

The mass percent composition of aluminum in the aluminum oxide is,

Mass  \: percent = \frac{ Mass \:  of \:  the  \: substance}{ Mass  \: of \:  the \:  compound} \times 100

Mass  \: percent =  \frac{Mass  \: of \:  the  \: aluminum}{ Mass \:  of \:  the \:  aluminum \: oxide } \times 100

Mass \:  percent  =  \frac{3.53}{6.67 } \times 100

= 52.9 %

Therefore, the mass percent composition of aluminum is 52.9% in aluminum oxide.

To know more about aluminum oxide, refer to the below link:

brainly.com/question/25869623

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7 0
2 years ago
Lifting a rope A mountain climber is about to haul up a 50-m length of hanging rope. How much work will it take if the rope weig
timama [110]

Answer:

780 J

Explanation:

W=\int _{\:0}^{50}0.624xdx

4 0
2 years ago
A bullet is fired through a board 13.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of t
GREYUIT [131]

Answer:

392307.6923 m/s²

Explanation:

t = Time taken

u = Initial velocity = 560 m/s

v = Final velocity = 460 m/s

s = Displacement = 13 cm

a = Acceleration

From the equation of motion we have

v^2-u^2=2as\\\Rightarrow a=\dfrac{v^2-u^2}{2s}\\\Rightarrow a=\dfrac{460^2-560^2}{2\times 13\times 10^{-2}}\\\Rightarrow a=-392307.6923\ m/s^2

The acceleration of the bullet as it passes through the board is -392307.6923 m/s²

5 0
3 years ago
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