A student grabs a piece of paper and tears it from the middle. Which statement best explains the forces involved? a. The friction between the hands and the paper interacts with gravity and causes the paper to tear.
b. The normal force between the molecules of the paper is overcome by the contact force of the hands.
c. The electrostatic forces from the contact of the hands with the paper causes the paper molecules to separate.
d. The magnetic force between the hands and the paper separates the molecules of the paper.

The electrostatic forces from the contact of the hands with the paper causes the paper molecules to separate.

Here's the rest of the answers

1.) Which statement is correct about the strength of forces?

Electrostatic forces are trillions of times stronger than gravitational forces.

2.) A student tries to push a book across a table. Which forces acting on the book are a result of electrostatic forces?

normal force and friction

3.) What type of force can explain how a gecko climbs up a wall?

contact forces

5.) A heavy hammer is sitting on top of a board. Which statement correctly describes why the hammer does not go through the board?

The electrostatic forces between the molecules of the board prevent the force of gravity from breaking the board apart.

hèllo, sorry i really need some more points so if you need this qustion answered than retype it

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.