Properties that change when the size of an object changes are called?

Physical Properties.

The change on the size of an object usually is caused for a change in the temperature of the object, which can be thermal expansion or thermal compression.

On other hand, if an object size changes, the volume also changes accordingly, and the mass stays the same, which implies that the density D = also changes inversely proportional to the volume.

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.