Answer:

Explanation:
We have given that the battery has an internal emf of 9 volt
So E = 9 volt
Capacitance 
It is given that on the terminal voltage is only 80% of potential difference
So V = 0.8×9 = 7.2 volt
We know that energy stored in the capacitor is given by

Answer: A medium is any substance or region through which a wave is transmitted. The speed of a wave is dependant on four factors: wavelength, frequency, medium, and temperature. Wave speed is calculated by multiplying the wavelength times the frequency (speed = l * f).
Astronomers give stars names so that they're able to identify and keep track of them more easily.
Chemical sedimentary rocks are formed through evaporation and precipitation of minerals in solution.
For instance, travertine limestone, gypsum, or halite (salt).
To calculate the kinetic coefficient of friction is closest to: 1. 0.23.
<u>Given the following data:</u>
- Horizontal force = 4.5 Newton
To calculate the kinetic coefficient of friction:
Mathematically, the kinetic force is given by this formula;

<u>Where;</u>
represents the kinetic force.
is the normal force.
- μ represents the kinetic coefficient of friction.
Making μ the subject of formula, we have:

Substituting the given parameters into the formula, we have;

u = 0.225 ≈ 0.23
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