What does it mean to say that the forces acting on an object are balanced? a. the forces occur as pairs of forces with equal magnitude and direction. b. all the forces combine to give zero net force. c. the sum of the horizontal forces is zero. d. the forces all have the same magnitude.

c.the charges if the proton and electron and gravity

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.