Answer:
0.7 hours
Explanation:
From the way back, we can calculate the distance between Irina's work and Irina's home. In fact, we know that the car takes 0.4 hourse traveling at 27 mph, so the distance covered should be
When Irina rides to work with her bike, she travels at a speed of 16 mph. So we can find the time she takes by dividing the total distance (10.8 miles) by her speed:
Newton has 3 Laws specifically The Three Laws of Motion
Answer:
Explanation:
Given that, the distance between the electrode is d.
The electron kinetic energy is Ek when the electrode are at distance "d" apart.
So, we want to find the K.E when that are at d/3 distance apart.
K.E = ½mv²
Note: the mass doesn't change, it is only the velocity that change.
Also,
K.E = Work done by the electron
K.E = F × d
K.E = W = ma × d
Let assume that if is constant acceleration
Then, m and a is constant,
Then,
K.E is directly proportional to d
So, as d increase K.E increase and as d decreases K.E decreases.
So,
K.E_1 / d_1 = K.E_2 / d_2
K.E_1 = E_k
d_1 = d
d_2 = d/3
K.E_2 = K.E_1 / d_1 × d_2
K.E_2 = E_k × ⅓d / d
Then,
K.E_2 = ⅓E_k
So, the new kinetic energy is one third of the E_k
Answer:
- The limitation of the maximum number of electrons in a given energy level can be used to account for the periodic recurrence of properties as the number of electrons increases.
Explanation:
First - Scientists have not yet determined exactly why electrons do not collapse into the nucleus. FALSE: Scientists do know why electrons do not collapse. Since the beginins of quantum mechanics it's known that the energy at small scales is quantized, that means there only can be certain values meaning that the energy do not change continously. In the case of the electron, it can only have certain levels of energy, that means they do not radiate continously as the go arround the atom, instead it is only allowed to have a certain amount of energy in a given state therefore it can not lose energy continously collapsing into the nucleus.
Second - Electrons cannot be located between levels except when they are in the process of moving. FALSE: We can not say that a electron moves between energy levels, it only can exist in any of the levels, but never in between. Also, the electron in any of its possible energy lavels can not be located with complete certainty due to the uncertainty principle.
Fourth - Electrons have any random energy. FALSE: as exposed above the electrons can only have certain cuantized energy levels acordinly to the rules of quantum physics
Fifth - Electrons can be found between energy levels. FALSE: Like said before we can not say that a electron exists between energy levels, it only can exist in any of the allowed levels, but never in between.
Thirth (correct one) : - The limitation of the maximum number of electrons in a given energy level can be used to account for the periodic recurrence of properties as the number of electrons increases. TRUE: the maximum number of electrons allowed in a given energy level directly determines the tipe of bond an atom can made with another (this due to the number of electrons in the higest energy level), so for example the elements in the left of a given row of the periodic table tend to have ionic bonds, but in the other hand the elements on right side tend form more covalent bonds. And this characteristic directly correllate with diferent properties of the elements.
