Which statement about velocity is true? A. It has only magnitude. B. It has only direction. C. It has magnitude and direction. D
2 answers:
Answer: The correct answer is Option C.
Explanation:
There are 2 types of quantities:
1. Scalar quantity: To describe these quantities, only magnitude is required. For example: Speed, distance etc..
2. Vector quantity: To describe these quantities, we require both direction and magnitude. For example: Velocity, displacement etc..
Velocity is defined as the rate of change of displacement.
Mathematically,
where, v = velocity
d = displacement
t = time
As, velocity is a vector quantity.
Hence, the velocity has both magnitude and displacement. Therefore, the correct answer is Option C.
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Answer : The standard reduction potential, is -0.13 V.
Solution : Given,
(1 KJ = 1000 J)
The net reaction is,
The half cell reactions are :
At cathode :
At anode :
First we have to calculate the by using formula,
where,
= Gibbs's free energy
n = number of electrons in a net chemical reaction = 6 electrons
F = Faraday constant = 96485 C
= standard cell potential
Now put all the given values in this formula, we get
Now we have to calculate the by using formula,
Now put all the given values in this formula, we get
Therefore, the standard reduction potential, is -0.13 V.