The density of air on the earth decreases almost linearly with height from 1.22kgm–3 at sea level
to 0.74 kgm–3 at an altitude of 5000m.
atmospheric pressure at the earth’s surface on a particular day is 1pa. the value of g
between the earth’s surface and an altitude of 5000 m can be considered to have a constant
value of 9.7ms–2.
what will be the atmospheric pressure at an altitude of 5000m?
the answer is 52000 pa

answer; i believe that the correct answer is (d) a very small amount of mass

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.