Water can be thought to be made up of millions of tiny little particles. These tiny particles are constantly moving. At higher temperatures, particles have more energy and they move faster. Given below is water at different temperatures. In which one will the particles of water be moving the fastest?

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length

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.