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3 years ago

What force holds the earth-moon system together?

Physics

2 answers:

Verdich [7]3 years ago

7 0

Gravity holds the system together

valentinak56 [21]3 years ago

7 0

The force of gravity, attracting the Earth and the Moon to each other,
keeps the two bodies in orbit around their common center of mass.

(Gravity also keeps the common center of Earth-mass and Moon-mass
in orbit around the sun.)

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Adults with Down syndrome can often find work because they have received _____.

IrinaK [193]

Answer:

education and job training

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4 years ago

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A violin string is 45.0 cm long and has a mass of 0.242 g. When tightened on the neck of the violin, the distance between the pi

stiks02 [169]

Answer:

The tension is 75.22 Newtons

Explanation:

The velocity of a wave on a rope is:

$v=\sqrt{\frac{TL}{M}}$ (1)

With T the tension, L the length of the string and M its mass.

Another more general expression for the velocity of a wave is the product of the wavelength (λ) and the frequency (f) of the wave:

$v= \lambda f$ (2)

We can equate expression (1) and (2):

$\sqrt{\frac{TL}{M}}$ = $\lambda f$

Solving for T

$T= \frac{M(\lambda f)^2}{L}$ (3)

For this expression we already know M, f, and L. And indirectly we already know λ too. On a string fixed at its extremes we have standing waves ant the equation of the wavelength in function the number of the harmonic $N_{harmonic}$ is:

$\lambda_{harmonic}=\frac{2l}{N_{harmonic}}$

It's is important to note that in our case L the length of the string is different from l the distance between the pin and fret to produce a Concert A, so for the first harmonic:

$\lambda_{1}=\frac{2(0.425m)}{1}=0.85 m$

We can now find T on (3) using all the values we have:

$T= \frac{2.42\times10^{-3}(0.85* 440)^2}{0.45}$

$T=75.22 N$

3 0

3 years ago

Need help! What is true about the relationship among wavelength, frequency, and energy in electromagnetic radiation?

lesantik [10]

I believe the answer is D

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3 years ago

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What are 2 ways electromagnets are used

lisabon 2012 [21]

Electromagnets are used for various purposes but I fathom in this instance, the questioner is asking about how electromagnetics can be used to attraction or repulsion.
Example, electromagnets are used for attraction in cranes which attach them to containers in order to lift them.
Meanwhile, Maglev trains use electromagnets repulsive properties.

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3 years ago

What is the wavelenght of an earthquake wave if it has a speed of 11 km/s and a frequency of 15 Hz

Zolol [24]

Answer:

The wavelength is about 733 meters.

Explanation:

Use the wavelength-frequency relationship:

$\lambda = \frac{v}{f}= \frac{11000 \frac{m}{s}}{15 s^{-1}}\approx733m$

The wavelength is about 733 meters.

3 0

4 years ago