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MickeyAppleX
11.07.2019 •
Physics
What is the capacitance of a parallel place capacitor with plates of area 1.0 cm2 that are separated by a distance of 0.1 mm? assume that strontium titanate is the dielectric.
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Ответ:
C = 0.274μF.
The capacitance when a dielectric is present is given by the equation:
C = kε₀(A/d)
Where k is the dielectric constant of the material, ε₀ is a universal constant, A is the area of the capacitor's plates, and d is the distance that separate the plates.
A parallel plates capacitor with plates of area 1.0cm² that are separated by a distance of 0.1mm, the dielectric constant of the stronium titanate is 310 at a temperature of 20 ° C.
K = 310.00, ε₀ = 8.85x10⁻¹²F/m, A = 1.00x10⁻²m², and d = 0.10x10⁻³m. Substituing the values in the equation C = kε₀(A/d):
C = (310.00)(8.85x10⁻¹²F/m)(1.00x10⁻²m²/0.10x10⁻³m)
C = (2.74x10⁻⁹F/m)(100m)
C = 2.74x10⁻⁷F
C = 0.274x10⁻⁶ = 0.274μF
Ответ:
The speed of the coin is 0.2585 m/s when the spring returns to its relaxed position.
Explanation:
The length the spring is extended by = 0.24 - 0.17 = 0.07 m
Stiffness of spring = 0.3 N/m
In order to solve this, we simply need to take convert all the potential energy of the spring into kinetic energy for the coin. This is:
Potential energy = 0.5 * k * x^2
Potential energy = 0.5 * 0.3 * 0.07^2
Potential energy = 0.000735 Joules
Since this is equal to kinetic energy we have:
Kinetic energy = 0.000735
0.5*m*V^2 = 0.000735
0.5 * 0.022 * V^2 = 0.000735
V^2 = 0.06682
V = 0.2585 m/s Or 28.85 cm/s