Physics, 02.03.2020 21:40 hall7948

A tuning fork is struck against a hard surface. The particles in the tuning fork begin to vibrate quickly, transmitting a wave. What kind of wave does the tuning fork transmit?

seismic wave

mechanical wave<- I was thinking this one but i'm not sure, please help!

electromagnetic wave

radio wave

Answers: 2

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Answer from: rydro6915

Mechanical waves

Explanation:

Waves are classified into two types:

- Electromagnetic waves: these waves are oscillations of the electric and magnetic fields in a direction perpendicular to the motion of the wave. They all travel at the speed of light in a vacuum, and they are the only waves able to travel through a vacuum. Examples of electromagnetic waves are visible light, radio waves, microwaves..

- Mechanical waves: these waves are produced by the oscillations of the particles in a medium. Due to their nature, they cannot travel in a vacuum, since there is no medium. Examples of mechanical waves are: sound waves, seismic waves, etc.

In this problem, the tuning fork is struck against a hard surface; as we know, the particles in the tuning force begin to vibrate quickly, causing vibrations in the particles in the air. These are sound waves: sound waves are mechanical waves (because they are produced by the vibrations of the particles in the medium), therefore the correct answer is

Mechanical wave

Answer from: Quest

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

$p(t)=0.3t^2+6t+80$

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

$p(0)=0+0+80=80$

according to question, we have said that if the population has twice its initial population, then it becomes

$p(t)=2\times 80=160$

so, time taken to reach this above mentioned population is given by

$160=0.3t^2+6t+80\\\\160-80=0.3t^2+6t\\\\80=0.3t^2+6t\\\\0.3t^2+6t-80=0\\\\\text{using quadratic formula ,we get }\\\\t_{1,\: 2}=\frac{-60\pm \sqrt{60^2-4\cdot \: 3\cdot \: 800}}{2\cdot \: 3}\\\\t=-29.14\ and\ t=9.149$

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.

Answer from: Quest

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d

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