A 15-kg object experiences a 65-N force for 0.34 seconds. What is the momentum change of the object?

22.1Ns

Explanation:

Given parameters:

Mass of object  = 15kg

Force exerted  = 65N

Time = 0.34s

Unknown:

Momentum change  = ?

Solution:

Momentum change is the same as the impulse on a body

   Impulse  = Force x time

So;

 Momentum change  = 65 x 0.34 = 22.1Ns

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.