The main part of Dalton's theory that remains true is that the atoms are not created, destroyed or splited during a chemical reaction which is the principle of the mass conservation law applied to the chemical reactions.
Two wrong points are that Dalton affirmed that the atoms could no be divided into smaller particles (atoms can be divided into several subatomic particles) and that the atoms of a same element are identicals (isotopes are atoms of a same element that differ in the number of neutrons)
Answer:
See explanation below.
Explanation:
For this case we atart fom the proportional model given by the following differential equation:
And if we rewrite this expression we got:
If we integrate both sides we got:
And using exponential on both sides we got:
Where represent the initial amount for the isotope and t the time in years and A the amount remaining.
If we want to apply a model for the half life we know that after some time definfd the amount remaining is the hal, so if we apply this we got:
We can cancel and we got:
If we solve for k we can apply natural log on both sides and we got:
And that would be our proportional constant on this case.
If we replace this value for k int our model we will see that:
And using properties of logs we can rewrite this like that:
And thats the common formula used for the helf life time.
The sum of balanced forces will always be equal to zero.
To solve this problem it is necessary to apply the concepts related to the magnetic flow of a coil and take into account the angles for each case.
It is also necessary to delve into part C, the concept of electromotive force (emf) which is defined as the variation of the magnetic flux as a function of time.
By definition the magnetic flux is determined as:
Where
N = Number of loops We will calculate the value for each of the spins
B = Magnetic Field
A = Cross-sectional Area
Angle between the perpendicular cross-sectional area and the magnetic field.
PART A) The magnetic flux through the coil after it is rotated is as follows:
PART B) For the second case the angle formed is perpendicular therefore:
PART C) The average induced emf of the coil is as follows:
The answer is B. An antitussive will help a cough by deterring the cough reflex.