Answer: A) black
Explanation:
Let's begin by explaining that a primary color is one that can not be obtained by mixing any other color. In this sense, red, green and blue are the primary colors of light (using the additive theory of color), but not the primary colors of the pigments.
For the case of pigments (using the subtractive color theory) the primary colors are cyan, magenta and yellow. This is because the pigments generally absorb more light than they reflect (they absorb certain wavelengths and reflect others). Therefore, the color that a given object seems to have depends on which parts of the visible electromagnetic spectrum are reflected and which parts are absorbed.
Hence, according to the subtractive theory, if we join the three primary colors of the pigments, we will obtain the black. Unlike the additive theory of light, in which if we join the three primary colors we will get white light.
This means:
If a paper that absorbs red-orange-yellow-green-blue-indigo-violet is illuminated with white light, the collors our eyes will see is black.
Considering the definition of speed, the speed of Sam is 3.6 
.
<h3>Definition of speed</h3>
Speed is a quantity that expresses the relationship between the space traveled by an object. That is, the speed is associated with the change of position of an object in space within a certain amount of time.
The speed can be calculated using the expression:
<h3>Speed of Sam</h3>
In this case, you know:
- displacement= 9 km
- time= 2.5 h
Replacing in the definition of speed:
Solving:
<u><em>speed= 3.6 </em></u>
Finally, the speed of Sam is 3.6 .
Learn more about speed:
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Answer and Explanation:
As per the question:
When the stone is thrown from the cliff top and hits the ground below eventually:
R = 
where
= initial velocity
H = height
g = acceleration due to gravity
R = horizontal Range
Now,
(a) Displacement of the stone is given by the horizontal range:
R =
where
= initial velocity
H = height
g = acceleration due to gravity
R = horizontal Range
(b) Speed just prior to the impact is given by the third equation of motion:
where
v = final velocity
(c) Time of flight is given by the second eqn of motion where the initial velocity is considered to be 0 then:
T = 
Using Dimensional analysis
15min/1·1hr/60min
15/1·1hr/60=15/60hr
.25hr
.25hr·12.5Km/h=3.125Km
Answer:
the thickness of the glass divided by thickness of water is going to be 1.333 divided by 1.52, which is 0.877. So, the height of this glass, in order to have the same number of wavelengths as in water, the height of the glass will be 0.877 times the height of the water, and so it will be smaller.
