Answer:
4.17 m/s²
Explanation:
We are told the reaction time is 0.2 s. Now, during this reaction time the car is going to travel an additional distance of
: x = u × t = 40 × 0.2 = 8 m
where u is the initial velocity of the car which is 40.0 m/s.
We are told that he had 200 m to stop before applying brakes. Thus, after applying brakes, he now has a distance to cover of; s = 200 - 8 = 192 m
Since vehicle is coming to rest acceleration would be negative, thus using Newton's equation of motion, we have;
v
² = u² - 2as
v = 0 m/s since it's coming to rest
u = 40 m/s
s = 192 m
Thus;
0² = 40² - 2(a)(192)
0² = 1600 - 384a
a = 1600/384
a = 4.17 m/s²
The magnitude of the electrical force between a pair of charged particles is 4 Times as much when the particles are moved half as far apart.
This can be easily understood by Columb's law,
![F_{new} = \frac{kQ_{1}Q_{2}}{r^{2}}](https://tex.z-dn.net/?f=F_%7Bnew%7D%20%3D%20%5Cfrac%7BkQ_%7B1%7DQ_%7B2%7D%7D%7Br%5E%7B2%7D%7D)
which state's that the amount of electrical force experienced by two charged particles is inversely proportional to the square of the distance between them.
∴ ![\frac{F_{new} }{F_{old} } = \frac{Distance_{new}^{2} }{Distance_{old}^{2} }](https://tex.z-dn.net/?f=%5Cfrac%7BF_%7Bnew%7D%20%7D%7BF_%7Bold%7D%20%7D%20%3D%20%5Cfrac%7BDistance_%7Bnew%7D%5E%7B2%7D%20%20%7D%7BDistance_%7Bold%7D%5E%7B2%7D%20%20%7D)
Now, we know the new distance is half the original distance,
![F_{new} = \frac{kQ_{1}Q_{2}}{\frac{r}{2}^{2} } \\F_{new} = 4\frac{kQ_{1}Q_{2}}{r^{2}}](https://tex.z-dn.net/?f=F_%7Bnew%7D%20%3D%20%5Cfrac%7BkQ_%7B1%7DQ_%7B2%7D%7D%7B%5Cfrac%7Br%7D%7B2%7D%5E%7B2%7D%20%7D%20%5C%5CF_%7Bnew%7D%20%3D%204%5Cfrac%7BkQ_%7B1%7DQ_%7B2%7D%7D%7Br%5E%7B2%7D%7D)
![F_{new} = 4F_{old}](https://tex.z-dn.net/?f=F_%7Bnew%7D%20%3D%204F_%7Bold%7D)
The electrical force of attraction or electrostatic force of attraction between two charged particles refers to the amount of attractive or repulsive force that exists between the two charges. This can be calculated by Columb's Law.
A charged particle in physics is a particle that has an electric charge. It might be an ion, such as a molecule or atom having an excess or shortage of electrons in comparison to protons. The same charge is thought to be shared by an electron, a proton, or another primary particle.
Learn more about electrical force here
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Answer:
22510.8J
Explanation:
Given parameters:
Mass of lead = 4.68kg
Initial temperature = 25°C
Final temperature = 62°C
Unknown:
The heat needed to cause this temperature change = ?
Solution:
To solve this problem, we use the expression below:
H = m c Ф
H is the quantity of heat
m is the mass
c is the specific heat capacity
Ф is the temperature change
So;
Specific heat capacity of lead = 130J/kg°C
Insert the parameters and solve;
H = 4.68 x 130 x (62 - 25) = 22510.8J
Answer:
C It will be closer to the mass of Vi–193.
Explanation:
The average atomic mass of vitellium will be closer to the mass of Vi–193.
From the geonormal abundance we can derive the average atomic mass or relative atomic mass of the compound.
Average atomic mass = sum of all the product of the mass of isotope x abundance of isotope
Average atomic mass = (10.861% x 187.9122) + (12.428% x 190.9047) + (76.11% x 192.8938)
Average atomic mass = 20.41 + 23.73 + 146.81 = 190.95amu