Wow ! They could set up sheets of "slow glass" beside beautiful forests with rivers and squirrels and deer and grassy fields, and load a year of this scene into the glass, and then sell it to people who live next to dirty brick walls or ugly empty lots, and those people could install the slow glass in their windows and have beautiful scenery, until it all worked its way out of the glass.
This is a great idea ! If you possibly can, find and read the sci-fi short story "Light of Other Days" written by Bob Shaw, published in Analog Science Fiction in 1966. It's all about this exact type of glass. I read this story in 1966 and I never forgot it ! (Not yet anyway.)
1Hz = One Cycle and One Cycle = 360degrees
When you want to find the difference caused by a time separation of two waves, you can find how much of a wave cycle will pass during the time delay.
At 0.25Hz, it takes 4 seconds to make 1 Cycle. With some algebra you find that 1 cycle every 4 seconds = <em>a quarter cycle every 1 second</em>.
So now that you know a one second delay causes a quarter of a cycle to pass, you can convert that into degrees by multiplying 0.25 and 360. 0.25x360=90
Lo and behold, a time difference of 1 second, creates a <u>phase seperation of 90 degrees</u>.
Answer:
Speed is a description of how fast an object moves; velocity is how fast and in what direction it moves. In physics, velocity is speed in a given direction. When we say a car travels at 60 km/h, we are specifying its speed.
Answer:
Explanation:
We shall apply Bernouli's theorem
ρgh + 1/2 ρ v² + P = constant
ρ is density of fluid ( here it is air ) v is velocity of air , P is pressure of air
For h to be constant
1/2 ρ v² + P = constant
1/2 ρ₁ v₁² + P₁ = 1/2 ρ₂ v₂² + P₂
P₂ -P₁ = 1/2 ρ₁ v₁² - 1/2 ρ₂ v₂²
P₂ -P₁ = Pressure difference = 20 x 32
ρ₁ and ρ₂ are same here and is equal to .07967 lb/ft³
Putting the values we get
20 x 32 = 1/2 x .07967 ( v₁² -v₂² )
( v₁² -v₂² ) = 16066
v₂ = 350 ft/s
v₁²-350² = 16066
122500 + 16066 = v₁²
v₁² = 138566
v₁ = 372 ft/s
[ At lower wing velocity will be lower so that pressure will be higher.]