In a longitudinal wave, the motion of the medium is parrellel to the direction of the wave.
A book can have energy by its words by how it’s talking in the book. honestly I’m not too sure that’s just how I would explain it
When light passes from one medium to another at an angle, it may refract, or bend, according to Snell's law:
n₁sin(θ₁) = n₂sin(θ₂)
n₁ = index of first medium, θ₁ = angle of incidence, n₂ = index of second medium, θ₂ = angle of refraction
Given values:
n₁ = 1.33 (water), θ₁ = 45.0°, θ₂ = 40.3°
Plug in and solve for n₂:
1.33sin(45.0°) = n₂sin(40.3°)
n₂ = 1.454
I looked up this value on the HyperPhysics indices of refraction table... The index we calculated is closest to 1.46, which is that of fused quartz.
<span>The Ptolemaic theory of the universe was
disproved by Nicolaus Copernicus (1473–1543), letter C and followed by Johannes
Kepler (1571–1630). <span>Geocentric
theory suggested that the Sun and moon orbited Earth, and the rest of the
planets orbited the Sun is Heliocentric theory. Heliocentric theory of Nicolaus
Copernicus during the Scientific Revolution on 17th and 18th
century while Geocentric theory was proposed by Ptolemy (AD 150) and Aristotle.
Today, we believe more on the Heliocentric theory and it has been proven as
well.</span></span>
<span> </span>
Answer:B
Explanation:
Given
First motor has three times as much as power as another
Let the power of smaller motor be P
Therefore bigger motor has power 3 P
and we know that energy 
Larger motor 
Smaller motor 
Therefore smaller motor will do same work if it takes three times the time taken by Larger motor
