To develop this problem we will start from the definition of entropy as a function of total heat, temperature. This definition is mathematically described as
![S = \frac{Q}{T}](https://tex.z-dn.net/?f=S%20%3D%20%5Cfrac%7BQ%7D%7BT%7D)
Here,
Q = Total Heat
T = Temperature
The total change of entropy from a cold object to a hot object is given by the relationship,
![\Delta S = \frac{Q}{T_{cold}}-\frac{Q}{T_{hot}}](https://tex.z-dn.net/?f=%5CDelta%20S%20%3D%20%5Cfrac%7BQ%7D%7BT_%7Bcold%7D%7D-%5Cfrac%7BQ%7D%7BT_%7Bhot%7D%7D)
From this relationship we can realize that the change in entropy by the second law of thermodynamics will be positive. Therefore the temperature in the hot body will be higher than that of the cold body, this implies that this term will be smaller than the first, and in other words it would imply that the magnitude of the entropy 'of the hot body' will always be less than the entropy 'cold body'
Change in entropy
is smaller than ![\Delta S_{cold}](https://tex.z-dn.net/?f=%5CDelta%20S_%7Bcold%7D)
Therefore the correct answer is C. Will always have a smaller magnitude than the change in entropy of the cold object
You did not provide the options. However, the options are
I = 6.0, R= 4.0 ohms
I = 9.0, R= 2.0ohms
I = 3.0, R= 2.0ohms
I = 8.0, R= 8.0 ohms
Answer:
The order of the resistors from the highest to the lowest is:
I = 8.0, R= 8.0 ohms
I = 6.0, R= 4.0 ohms
I = 9.0, R= 2.0ohms
I = 3.0, R= 2.0 ohms
Explanation:
ohm's law states that voltage across a conductor is directly proportional to the current flowing through it. V = IR
Based on this formula, the voltages in each of the resistors are calculated below from the highest to the lowest
V = 8 * 8 =64 volts
V = 6 * 4 =24 volts
V = 9 * 2 =18 volts
V = 3 * 2 =6 volts
Complete question:
if two point charges are separated by 1.5 cm and have charge values of +2.0 and -4.0 μC, respectively, what is the value of the mutual force between them.
Answer:
The mutual force between the two point charges is 319.64 N
Explanation:
Given;
distance between the two point charges, r = 1.5 cm = 1.5 x 10⁻² m
value of the charges, q₁ and q₂ = 2 μC and - μ4 C
Apply Coulomb's law;
![F = \frac{k|q_1||q_2|}{r^2}](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bk%7Cq_1%7C%7Cq_2%7C%7D%7Br%5E2%7D)
where;
F is the force of attraction between the two charges
|q₁| and |q₂| are the magnitude of the two charges
r is the distance between the two charges
k is Coulomb's constant = 8.99 x 10⁹ Nm²/C²
![F = \frac{k|q_1||q_2|}{r^2} \\\\F = \frac{8.99*10^9 *4*10^{-6}*2*10^{-6}}{(1.5*10^{-2})^2} \\\\F = 319.64 \ N](https://tex.z-dn.net/?f=F%20%3D%20%5Cfrac%7Bk%7Cq_1%7C%7Cq_2%7C%7D%7Br%5E2%7D%20%5C%5C%5C%5CF%20%3D%20%5Cfrac%7B8.99%2A10%5E9%20%2A4%2A10%5E%7B-6%7D%2A2%2A10%5E%7B-6%7D%7D%7B%281.5%2A10%5E%7B-2%7D%29%5E2%7D%20%5C%5C%5C%5CF%20%3D%20319.64%20%5C%20N)
Therefore, the mutual force between the two point charges is 319.64 N
The most probable reason why the magnets won't stick on the refrigerator is that the body of the refrigerator and the magnets have like poles. If both have negative or both have positive poles facing each other, they will repel. In principle, magnets are attracted to opposite poles and like poles repel.