Answer:
<h3>» equal , opposite</h3>
Explanation:
For every force there is one that is <u>equal</u><u> </u>
in size but <u>opposite</u> in direction.
<h3>because , </h3>
<h3>Newton's Third law states that</h3>
<h3>For every force, there is another force of equal magnitude, acting in the opposite direction.</h3>
Frequency = (speed) / (wavelength) = 20 / 0.5 = 40 per second = 40 Hz.
When the mass is 5.0 cm from its equilibrium point, the percentage of its energy that is kinetic is 75%.
<h3>Total energy of the mass</h3>
The total energy possessed by the mass under the simple harmonic motion is calculated as follows;
U = ¹/₂kA²
where;
- k is the spring constant
- A is the amplitude of the oscillation
<h3>Potential energy of the mass at 5 cm from equilibrium point</h3>
P.E = ¹/₂k(Δx)²
<h3>Kinetic energy of mass</h3>
K.E = U - P.E
K.E = ¹/₂kA² - ¹/₂k(Δx)²
<h3>Percentage of its energy that is kinetic</h3>

Thus, when the mass is 5.0 cm from its equilibrium point, the percentage of its energy that is kinetic is 75%.
Learn more about kinetic energy here: brainly.com/question/25959744
A) 1.55
The speed of light in a medium is given by:

where
is the speed of light in a vacuum
n is the refractive index of the material
In this problem, the speed of light in quartz is

So we can re-arrange the previous formula to find n, the index of refraction of quartz:

B) 550.3 nm
The relationship between the wavelength of the light in air and in quartz is

where
is the wavelenght in quartz
is the wavelength in air
n is the refractive index
For the light in this problem, we have

Therefore, we can re-arrange the equation to find
, the wavelength in air:
