Answer:
The age of the rock = 2800.6 million years = 2.8 billion years.
A simple method of analysis similar to Carbon dating is used to obtain the required age of the rock. Radioactive substances decay according to first order reaction kinetics. So, plugging all the required parameters into the general equation for amount of substance left in a first order decay gives us the age of the rock.
Explanation:
Half life of Uranium-235 = 700 million years (from literature)
The decay of radioactive substances follow first order reaction kinetics.
The general equation is given as
A(t) = A₀ e⁻ᵏᵗ
A(t) = Amount of radioactive substance left after a particular time = 6.25%
A₀ = initial amount of radioactive substance = 100%
t = time that has passed since the beginning = age of the rock = ?
k = decay constant
The decay constant is related to the half life (T) through the relation,
k = (In 2)/T
k = (0.693/700) = 0.00099 /million years
A(t) = A₀ e⁻ᵏᵗ
6.25 = 100 e⁻ᵏᵗ
0.0625 = e⁻ᵏᵗ
In e⁻ᵏᵗ = In 0.0625 = -2.7726
-kt = - 2.7726
t = (2.7726/0.00099) = 2800.6 million years
t = 2.8 billion years.
Hope this Helps!!!
Local shear failure occurs when the shear stresses parallel to the grain, i.e. shear stresses acting in the longitudinal-tangential (LT) or longitudinal-radial (LR) planes, exceed the shear strength of the beam. The shear strength of a wood member is difficult to quantify.
Answer:
The coast is a climate on its own.
Explanation:
If there is a comparison between a location with a coast near it, there will always be a climate difference. If the coast happens to be thee Pacific Coast, it is typically colder and more wet due to a lot more rain than more inland cities, but since the Pacific Ocean is colder than the Atlantic, it is not as muggy and humid as the East Coast.
If the coastal town is on the Atlantic Ocean Coastline, it will be more humid, where the air feels heavy and it will be hotter in general due to the heat from the Atlantic Ocean.
1. Bushmeat
2. Cash Crop
3. Desalinization
4. Desertification
5. Globalization
6. Ground Water
7. Organic Farming
8. Sustainable
I think it is Racial background
