According to the visible spectrum, we can deduce the following:
- Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
- Objects that absorb longer wavelengths are perceived as <u>blue</u>.
- Objects that reflect all wavelengths are perceived as <u>white</u>.
- Objects that absorb all wavelengths are perceived as <u>black</u>.
<h3>What is light?</h3>
Light can be defined as a form of electromagnetic waves (radiation) that do not require any medium for its propagation. Thus, light is generally referred to as a visual signal because it can be seen with the eyes.
<h3>The wavelength of light.</h3>
Based on scientific records, the wavelengths of light that can be seen by humans with their eyes is between the range of 400 to 750 nanometers (nm).
According to the visible spectrum, we can deduce the following:
- Objects that absorb shorter wavelengths of light are perceived as <u>red</u>.
- Objects that absorb longer wavelengths are perceived as <u>blue</u>.
- Objects that reflect all wavelengths are perceived as <u>white</u>.
- Objects that absorb all wavelengths are perceived as <u>black</u>.
Read more on wavelength here: brainly.com/question/25699025
Answer:
Dx/dt = 4,8 f/s
Explanation:
The ladder placed against a wall, and the ground formed a right triangle
with x and h the legs and L the hypothenuse
Then
L² = x² + h² (1)
L = 26 f
Taking differentials on both sides of the equation we get
0 = 2x Dx/dt + 2h Dh/dt (1)
In this equation
x = 10 distance between the bottom of the ladder and the when we need to find, the rate of the ladder moving away from the wall
Dx/dt is the rate we are looking for
h = ? The height of the ladder when x = 10
As L² = x² + h²
h² = L² - x²
h² = (26)² - (10)²
h² = 676 - 100
h² = 576
h = 24 f
Then equation (1)
0 = 2x Dx/dt + 2h Dh/dt
2xDx/dt = - 2h Dh/dt
10 Dx/dt = - 24 ( -2 ) ( Note the movement of the ladder is downwards)
Dx/dt = 48/10
Dx/dt = 4,8 f/s
Speed is a scalar quantity indicating how fast an object is moving, defined by the equation
Explanation:
Speed is a scalar quantity which tells how fast an object is moving, regardless of its direction.
The speed of an object can be calculated as follows:
where
d is the distance covered by the object
t is the time interval taken by the object to cover that distance
The SI units of the speed is the metre per second (m/s).
Speed must not be confused with velocity, which is instead a vector quantity, given by
where displacement is a vector measuring the distance in a straight line between the initial and final position of the object. Since velocity is a vector, the direction matters, therefore an object can have different speed and velocity. For instance, an object completing a full circle has non-zero speed (because the distance covered is non-zero), but its velocity is zero (since the displacement is zero, because the object returns to its starting position).
Learn more about speed and velocity:
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Answer: <u><em>78 miles apart if i can get brainliest that would be great </em></u>
Speed is given by dividing distance by time.
That is; speed = distance/time
In this case; speed = 52 mph and the time is 1.5 hours
Distance= speed × time
Thus; Distance = 52 × 1.5
= 78 miles
Thus the cities are 78 miles apart
