4hz is the answer i think atleast
Answer:
ρ₀ = 3λ/(2πR⁴)
Explanation:
If we take an elemental part of the cross sectional Area of the infinitely long cylinder.
The small elemental part has a small length dr in the cylinder's radial direction such that the cross sectional Area of the elemental part = 2πr dr
The linear density over the entire radial length of the cylinder will be equal to the sum of (volume charge density × elemental cross sectional Area)
That is,
λ = Σ ρ₀rR × 2πr dr
summing from 0 to R
λ = ∫ᴿ₀ (ρ₀rR × 2πr) dr
λ = ∫ᴿ₀ ρ₀R × 2πr² dr
λ = [ρ₀R × 2πr³/3 ]ᴿ₀
λ = (2π ρ₀R/3) [ r³ ]ᴿ₀
λ = (2π ρ₀R/3) [ R³ ]
λ = 2π ρ₀R⁴/3
ρ₀ = 3λ/(2πR⁴)
Answer:
Explanation:
Let assume that ball's motion is frictionless and its geometric dimensions can be neglected. Besides, it is assumed that ball begins at a height of zero. The ball can be modelled by means of the Principle of Energy Conservation:
The initial speed of the ball is:
Rate of speed (3 m/s north is three miles per second north, so it's a rate of speed)
The correct answer is - continental tropical air mass.
If an air mass forms over a land mass, than that air mass is of continental type. Depending on the location of the area where the air masses are forming, they can be cold or warm. In this case, we have an area that is warm, part of which is near the tropics, part bordering with them, thus we will have the formation of a continental tropical air mass.
This type of air masses is characterized by being hot and dry. That results in hot weather, usually with a period of drought, thus very dry. This type of air masses often cause lot of damage to the crops, but also can affect the human health, especially the elderly people.