The prongs on the plug and the wire inside<span> the </span>cord<span> are </span>metal<span> but they are </span>surrounded<span> by plastic or rubber insulation so you do not get shocked when you touch the </span>cord
Answer:
The equation which define the work done by spring is w = 45 x³ - 8 x²
Explanation:
Given as :
The force is the function of distance x
I.e F(x) = a x² - b x
where
a = 45 N/m²
b = 8 N/m
Now, Wok done = Force ×displacement
I.e W = F . ds
So , W = (a x² - b x) × x
or, W = (45 x² - 8 x) × x
Or, w = 45 x³ - 8 x²
So, the equation which define the work done by spring is w = 45 x³ - 8 x²
Hence The equation which define the work done by spring is w = 45 x³ - 8 x² Answer
I had to look for the options and here is my answer:
Given that a guitar string has a basic frequency of 500hz, the frequency that can be set for this into resonant vibration would be 1500 Hz. The resonant vibration here is necessary in musical instruments because it delivers a vibrating system which leads to a higher amplitude at a particular frequency.
Answer : The cell emf for this cell is 0.077 V
Solution :
The balanced cell reaction will be,
Oxidation half reaction (anode): 
Reduction half reaction (cathode): 
In this case, the cathode and anode both are same. So, 
is equal to zero.
Now we have to calculate the cell emf.
Using Nernest equation :
![E_{cell}=E^o_{cell}-\frac{0.0592}{n}\log \frac{[Zn^{2+}{diluted}}{[Zn^{2+}{concentrated}]}](https://tex.z-dn.net/?f=E_%7Bcell%7D%3DE%5Eo_%7Bcell%7D-%5Cfrac%7B0.0592%7D%7Bn%7D%5Clog%20%5Cfrac%7B%5BZn%5E%7B2%2B%7D%7Bdiluted%7D%7D%7B%5BZn%5E%7B2%2B%7D%7Bconcentrated%7D%5D%7D)
where,
n = number of electrons in oxidation-reduction reaction = 2
= ?
![[Zn^{2+}{diluted}]](https://tex.z-dn.net/?f=%5BZn%5E%7B2%2B%7D%7Bdiluted%7D%5D)
= 0.0111 M
![[Zn^{2+}{concentrated}]](https://tex.z-dn.net/?f=%5BZn%5E%7B2%2B%7D%7Bconcentrated%7D%5D)
= 4.50 M
Now put all the given values in the above equation, we get:
Therefore, the cell emf for this cell is 0.077 V
