The amount of charge on each plate is equal to 0.9 Coulombs.
<u>Given the following data:</u>
To calculate the amount of charge on each plate:
<h3>The formula for work done.</h3>
Mathematically, work done in moving a charge is given by this formula:

<u>Note:</u> The work done by an external force equals the change in potential energy for the charges that were moved.

But, 
Now, the work done becomes:

Making q the subject of formula, we have:

Charge, q = 0.9 Coulombs.
Read more on charge here: brainly.com/question/14327016
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Answer:
The frequency of the simple harmonic motion of a 67.6 kg diver on the board = 2.48 Hz
Explanation:
The frequency in simple harmonic motion is related to spring constant and mass causing the motion through the relation
f = (1/2π) √(k/m)
When mass = 10 kg, f = 6.90 Hz,
6.9 = (1/2π) √(k/10)
(√(k/10) = 6.9×2π = 43.354
k/10 = 43.354² = 1879.57
K = 18795.7 N/m
When a diver of mass 67 kg climbs the diving board, the total mass on the diving board now becomes (10+67.6) = 77.6 kg
Spring constant of the diving board doesn't change,
So, the frequency is then given by
f = (1/2π) √(18795.7/77.6)
f = 2.48 Hz
Answer: option A.
Explanation:
Q= heat removed from the water
m= mass of the water = 80 grams
c = heat capacity of water= 4.18 J/g°C
Q = -10,032 joules -10,000 Joules
Negative sign indicates that heat was removed from the water
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