Answer: <em>An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.</em>
Explanation: meaning, an object will continue in its same direction until stopped or acted upon by another force.
Answer:
I think this
One bulb burning out in a series circuit breaks the circuit. In parallel circuits, each light has its own circuit, so all but one light could be burned out, and the last one will still function.
I believe the correct answer from the choices listed above is the third option. The device you found was a radiosonde. It is <span>a battery-powered telemetry instrument package carried into the atmosphere usually by a weather balloon that measures various atmospheric parameters. Hope this answers the question. Have a nice day.</span>
<h2>
Answer: 1.73</h2>
Explanation:
The situation described here is known as polarization by reflection. This was discovered by Scottish physicist David Brewster and then formulated the law that bears his name:
<em>"When a beam of light hits the surface that separates two non-conducting media characterized by different electromagnetic characteristics (electrical permittivity and magnetic permeability), part of it is reflected back to the source medium, and part is transmitted to the second medium."</em>
This polarization happens when the light incides at a specific angle, called the Brewster angle (
), which is given by the following formula (<u>taking into account that generally the magnetic permeabilities of the two media involved do not vary):</u>
(1)
Where 
is the index of refraction of the second medium (the varnish in this case) and 
is the index of refraction of the first medium (the air).
Now, if we are told the angle between the incident and reflected rays is 
, this means the incident angle is the half (
), which is the Brewster angle in this case.
So, 
(2)
Rewriting (1) with this incident ray angle:
(3)
Finally we obtain the index ofrefraction of the varnish:
