Two books are located 2 m above the surface of the earth. the first has a mass of 4 kg; the second has a mass of 2 kg. which statement about the pull of earth's gravity is true?

a. the force of earth's gravity on the 2-kg book is stronger than the force of earth's gravity on the 4-kg book. b. the force of earth's gravity is the same on both books, because the two books are located at the same height above the earth. c. the force of earth's gravity is the same on both books, because when they're dropped, they'll both accelerate at 9.8 m/s2. d. the force of earth's gravity on the 4-kg book is stronger than the force of earth's gravity on the 2-kg book.

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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.