It’s the crest, the crest is the top part of the wave and the trough is the bottom so they correspond
Answer:
Mental time travel has been studied by psychologists, cognitive neuroscientists, philosophers and in a variety of other academic disciplines. Major areas of interest include the nature of the relationship between memory and foresight, the evolution of the ability (including whether it is uniquely human or shared with other animals), its development in young children, its underlying brain mechanisms, as well as its potential links to consciousness, the self, and free will.
Explanation:
Answer:
It is very rare to see a solar eclipse from your home, because the Earth, Sun, and the moon need to align just right. Not everyone in the world can view a solar eclipse, only some area can. A solar eclipse is where the moon blocks out the sun. If you think about it: Let's say you live in Florida, U.S.A. You may see the moon coming in front of the sun, but if you lived in California or sumthin', the moon and the sun wouldn't be aligned to form a solar eclipse. It all depends on location... so it is rare to see one.
Answer:
Assume that the planet <em>has a defined angular momentum (this is not true due to tidal friction). So if mass is farther away from the center of mass it will have more angular momentum, and if mass is near you will have more angular momentum.</em>
If the mass is similar to the center of mass and slower if the mass is farther from the center of mass, an object will spin faster to combat this. Building skyscraper will also slow down the earth and dropping leaves will raise the angular velocity.
A great example of this is with figure skaters, when they want to spin faster they tuck themselves in tightly, bringing more mass close to the center of mass which increases angular velocity there.
Answer: 
Explanation:
Given
Usain Bolt ran the race with a length 
Time is taken to complete it 
We know, 
Insert the values
So, the speed of Usain Bolt is
