What is the magnitude of the centripetal force that must be applied in order for a 2kg ball on a 2.0 m string to spin with unifo
2 answers:
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The time elapsed is 3229.2 days.
First-order reactions include those in radioactive decay. The reduction in radioactive nuclei per unit of time is the rate of decay, or activity, of a sample of a radioactive substance.
The Radioactive Formula is given by
N₀
Where N₀ = The initial quantity of the substance.
N = The quantity remained.
T = the half-life of the decaying quantity.
t = time elapsed
The initial quantity of the substance = 4.0 g
The quantity remained = 1.0 g
The half-life of the decaying quantity = 1620 years
Using formula;
Therefore, the time elapsed is 3229.2 days
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Answer:
q = 76.8*10⁻⁹ C = 76.8 nC
Explanation:
Assuming no other forces acting on the charges, and that both spheres must be considered as point charges (and as point masses as well) , the force that is responsible for the initial acceleration is the electrostatic force, which obeys Coulomb´s Law.
According to Newton´s 2nd Law, this force is related with the mass and the acceleration as follows:
This same force, expressed as the electrostatic force, is as follows:
As both expressions for F are equal each other, we can solve for q:
⇒ q = 76.8*10⁻⁹ C = 76.8 nC