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ASHA 777 [7]
3 years ago
9

1. A student demonstrates electromagnetic induction using a

Physics
1 answer:
Katen [24]3 years ago
4 0

answer is :D it would be a great answer

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A source of sound is kept in a jar in a vacuum. Air is slowly introduced in to the jar. What happens to the sound coming out of
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A hydraulic lift raises 1140 kg car through a height of 2.4 m. What is the potential energy
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3 years ago
1) If a sound with the same amplitude and energy is propagated at a source, predict through which medium the sound will travel t
Lady bird [3.3K]

Answer:

denser media the speed is greater

Explanation:

The speed of sound is given by the relation

  v= \sqrt{\frac{B}{\rho} }

where B is the volume modulus and ρ the density of the medium

When analyzing the previous expression, the amplitude of the sound depends on the energy carried by the wave.

Wave speed, is given by the relationship between two magnitudes, we analyze their values ​​for different media. The volume modulus for gases has values ​​of the order of 10⁵ Pa, for liquids of the order of 10⁹ Pa and for solids of 10¹⁰ to 10¹¹ Pa, while the density has values ​​of the order of 10⁻¹ to 10⁰ kg / m³ for gases for liquids 10³ kg / m³ and for solids of the order of 10³ to 10⁴ kg / m³

 

let's find the order of magnitude of the speed of sound

Gases

     v =√ 10⁵/10⁰ = 300 m / s

liquids

     v =√ 10⁹/10³ = 1000 m / s

solid

     v = √ 10¹¹/ 10⁴ = 3000 m / s

We can see that in denser media the speed is greater

5 0
3 years ago
A projectile is fired straight up from ground level. After t seconds it's height is above the ground is h feet where h=-16t^2+14
Rainbow [258]
<span>Plug in 288 for h, move it over to the right side and do the quadratic formula to solve for t. You will get 2 times, in between and including those times will give you the period it is at least 288 ft off the ground.

</span>You can simplify this and not need to use the quadratic. <span>288=−16<span>t^2</span>+144t
</span><span>Divide through by 16 getting
 18=-t^2 + 9t
</span><span><span>t^2</span>−9t+18=0</span><span> Is what you would get after rearranging the equation Now you have something you can easily factor</span><span>


</span>
5 0
3 years ago
Read 2 more answers
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