What is the repulsive electrical force between two protons 4.0×10−15m apart from each other in an atomic nucleus?

F = 14.4 N

Explanation:

As we know that the force between two charge particles is given by coulombs law as

here we have

also we have

now we will have

i believe it is b. what was the cause of the big bang

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answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.