Which modulus is used to describe a force perpendicular to an object, such as wind blowing against a building

Bulk Modulus

Explanation:

Bulk stress occurs when an object is acted upon by forces on all sides. An example is when an object is submerged in water and it experiences pressure from the water acting upon it on all sides. This is similar to a situation where the wind blows against a building. It is a form of volume stress because the object experiences pressure from all sides.

When the object experiences this pressure from the force acting on it, there is usually a change in volume. The modulus for bulk stress is Bulk Modulus.

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.