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strojnjashka [21]
3 years ago
15

True or false mechanical waves need a medium through which to transport energy

Physics
2 answers:
Anni [7]3 years ago
7 0

<em>Mechanical waves need a medium through which to transport energy is true</em>

Answer: <em>True </em>

Explanation:

Mechanical wave cannot travel in the absence of a material medium. The reason why sound can’t be heard in vacuum is because it is a mechanical wave. Seismic wave, which is produced during earthquakes and ocean waves are also mechanical waves.

Mechanical waves are of three types and they are

  • <em>Transverse wave </em>
  • <em>Longitudinal wave </em>
  • <em>Surface wave </em>

Electromagnetic waves are known for their propagation without a material medium. X-rays, light waves, infrared waves etc are electromagnetic waves.

Characteristic features of a wave are its frequency, wavelength, speed etc.

a_sh-v [17]3 years ago
4 0

Answer:True

Explanation: The mechanical waves need a medium through which to transport energy because the perturbation travels inside of the medium so it needs molecules that connect elastically the displacement of the wave. For example the sound mainly uses the air molecules to transport the energy also the sound can be traveled in solid materials like metal rods.

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Work of 2 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (i
Sidana [21]
The law applied here is Hooke's Law which describes the force exerted by the spring with a given distance. The equation for this is F = kΔx, where F is the force in Newtons, k is the spring constant in N/m while Δx is the displacement in meters.

If you want to find work done by a spring, this can be solved by using differential equations. However, derived equations are already ready for use. The equation is

W = k[{x₂-x₁)² - (x₁-xn)²],

where 
xn is the natural length
x₁ is the stretched length 
x₂ is also the stretched length when stretched even further than x₁

In this case xn =x₁. So, that means that (x₁-xn) = 0 and (x₂-x₁) = 11 cm or 0.11 m.

Then, substituting the values,

2 J = k (0.11² -0²)
k = 165.29 N/m

Finally, we use the value of k to the Hooke's Law to determine the Force.

F = kΔx = (165.29 N/m)(0.11 m)
F = 18.18 Newtons
5 0
3 years ago
The mass number of a nucleus (except Hydrogen) is:
netineya [11]
The mass number of a nucleus (except Hydrogen) is: number of protons + number of neutrons.

A=Z+N

A=mass number=protons + neutrons.
Z=atomic number=number of protons.
N=number of neutrons. 

In the case of Hydrogen it depends of isotope of Hydrogen . 
the hydrogen has three isotopes, 
protium : A=Z, because N=0
deuterium:  A=Z+N;   N=1
 tritium: A=Z+N;    N=2 
7 0
3 years ago
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Anastaziya [24]
1. B
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7 0
3 years ago
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What is necessary to designate a position? A. a reference point B. a direction C. fundamental units D. motion E. all of these
max2010maxim [7]

Answer:

E. all of these

Explanation:

The designation of a point in space all the points that necessary

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- a direction

- fundamental units

- a direction

- motion

all are necessary to designate a point in space. Hence option E is correct.

For example in simple harmonic motion we need to specify all the above factors of the object in order to designate the position of the object.  

8 0
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Which location on the map above is a source of North Atlantic deep water?
bija089 [108]
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