1. These solar sails are being developed to be used in space. Give a five sentence

response explaining how they might be used on Earth

Explanation:

Solar sails are a method of spacecraft propulsion by means of radiation pressure exerted by sunlight. Because they have few moving parts and do not have a propeller, they may theoretically be used for sailing in space, using the repulsive force of the Sun's rays. Lines will link the edge of one sail to the other.

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.