Answer:
Correct answer: Q = 0.247 μC
Explanation:
Since the oil drop floats, this means that the weight of the drop and the Coulomb force are equal.
F = m · g drop's weight
Fc = k q Q / r² Coulomb force
where it was given:
k = 9 · 10⁹ N m²/C² dielectric constant,
q = 2.2 mC = 2.2 · 10⁻³ C drop's charge,
Q - floor's charge,
r = 7.68 m distance between drop and floor
m = 8.3 grams = 8.3 · 10⁻³ kg drop's weight
and g = 10 m/s²
F = Fc ⇒ k q Q / r² = m · g ⇒ Q = m · g · r²/ k · q
Q = 8.3 · 10⁻³ · 10 · 7.68² / 9 · 10⁹ · 2.2 · 10⁻³
Q = 24.72 · 10⁻⁸ C = 0.2472 · 10⁻⁶ C = 0.2472 μC
Q = 0.247 μC
God is with you!!!
Roughly 13.8 billion years old according to science
Because during cold weather the oil thickens which make it harder for the staner motor to spin the engine.hope this helps :D
Answer:
The number of digits used to express a measured or calculated quantity. By using significant figures, we can show how precise a number is
Explanation:
