Answer:
Angle of incidence ray
Explanation:
The way light reflects off a smooth surface is described by the law of reflection. This law states that the angle of reflection equals the ANGLE OF INCIDENCE RAY.
This is because, when light is reflected off a smooth surface, the light is reflected by all the points that is present on that smooth surface.
Therefore the speed at which the light rays falls on the smooth surface is the same as the speed at which the light ray is reflected back. Due to their speed been the same, the distance of the incidence ray would also be the same as the distance of the reflected ray.
Hence the angle of incidence = angle of reflection.
Answer:
I Think its ABC
Explanation:
No air is the lightest
Helium is lighter than regular air that's why it goes up so then the regular air would be heaviest.
Answer:
a)
b)
Explanation:
We start the exercise knowing that a ball is thrown up with an initial velocity of 65 ft/s with an initial height of 680 ft.
To calculate the maximum heigh, we know that at the top of the motion the ball stop going up and start going down because of the <em>gravity</em>
First of all, we need to calculate the time that takes the ball to reach the maximum point.
a)
Knowing that time, <u><em>we can calculate the height to which the ball rises:</em></u>
b) Now, to know the time that the ball reach the bottom of the cliff, we know that the final height is y=0ft
This is a classic quadratic equation, that can be solve using the quadratic formula
a=-16.1
b=65
c=640
Solving for t, we have that
or
Since the time can not be negative:
The pressure at the depth h in the ocean is given by (Stevin's law)
where
is the atmospheric pressure
and
is the pressure exerted by the column of water of height h=4267 m, with
being the water density and
.
Substituting, we find
We want to convert this into atmospheres: we know that 1 atm corresponds to the atmospheric pressure at sea level, so
, therefore we just need to divide by this number: