D) Mars & Jupiter is correct
Geography uses other subject in it's studies. Very close to geography are geophysics and geology. Geophysics studies quantitatively physical phenomena of the planet Earth, geology studies composition of soil rocks and their development through history. Geography uses biology, statistics, mathematics and other subjects in order to better describe the Earth.
Answer:
The diagram shows 4 possible options for the centripetal force acting on the object represented as a black dot. The correct option is the direction marked as C since it points inwards and ties the object to its circular motion.
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!!!
North America, the third-largest continent<span>, extends from the tiny Aleutian Islands in the northwest to the Isthmus of Panama in the south. </span>
<span>North America’s </span>physical geography<span>, </span>environment<span> and </span>resource<span>s, and </span>human geography<span> can be considered separately.</span>
<span>North America and South America are named after Italian </span>navigator<span>Amerigo Vespucci. Vespucci was the first European to suggest that the Americas were not part of the </span>East Indies<span>, but an entirely separate landmass. The portions of the landmass that widened out north of the </span>Isthmus<span> of Panama became known as North America. oh and if this helped could you give me a brainlest please? Thanks have a nice day.</span>
