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3 years ago

A student grabs a piece of paper and tears it from the middle. Which statement best explains the forces involved?

Physics

2 answers:

PolarNik [594]3 years ago

3 0

Answer:

b. The normal force between the molecules of the paper is overcome by the contact force of the hands.

Explanation:

The paper molecules are held together by a weak bond. When the student holds the paper on both sides with the center of the paper in between, the student applies two equal forces in the opposite direction of the paper making the paper molecules weaken and separate.

stich3 [128]3 years ago

3 0

Answer:

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.

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Objects a and b each have a mass of 25 kilograms. object a has a velocity of 5.98 meters/second. object b is stationary. they un

mash [69]

The total kinetic energy of the system after collision is 223.5J

In elastic collision kinetic energy and momentum are conserved.

According to the question

mass of object a = 25kg

mass of object b = 25 kg

initial velocity of a u1 = 5.98 m/s

initial velocity of b u2 = 0

so from momentum conservation-

mau1 + mbu2 = (m1+m2)v

25kg × 5.98m/s + 25×0 = (25+25)v

v = 2.99 m/s

Now the total kinetic energy after the collision will be:

final kinetic energy = 1/2 (m1+m2) v²

= 1/2 (25+25)× (2.99)²

= 223.5 J

Thus, total kinetic energy of the system after collision is 223.5J

Learn more about elastic collision here:

brainly.com/question/1808045

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7 0

2 years ago

g As a proton moves in the direction the electric field lines A) it is moving from low potential to high potential and gaining e

Yuki888 [10]

Answer:

Option D => it is moving from high potential to low potential and losing electric potential energy.

Explanation:

Consider a big circle, within the circle we have force, F. That force, F is known as the Electric Field and inside the region or field or space, charged particle or object will be able to exerts force on the other objects.

Electric Field can be represented mathematically by using the formula below; E = kQ/r^2.

So, let us answer the question with what we have considered above. It is worthy of note to know that electric Field moves from a region of higher potential to a region of lower potential. So, any option that says this is correct.

But, there is only one problem and that is the fact that the question asked us about the direction of the movement of proton. Since, proton is s a positive charge, it is going to lose electric potential energy. So, Option D is correct.

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3 years ago

I need help on this.

4vir4ik [10]

It brings cold water from the bottom of the ocean.

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3 years ago

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Which pair of graphs represent the same motion of an object

ASHA 777 [7]

To be able to identify that the object is in the same motion, we should find the graphs that has an increasing slope of displacement and with the constant velocity with varying time. Graphs on letter D satisfies these requirements.

ANSWER: D

6 0

4 years ago

Read 2 more answers

Which of the following statements is FALSE about collisions? (Consider Newton's Laws an the Conservation of Momentum.)

pantera1 [17]

The following statements are false about collisions: 

The velocity change of two respective objects involved in a collision will always be equal.
Total momentum is always conserved between any two objects involved in a collision.

Answer: Option B, and D

Explanation:

In any collisions, equal amount of net force will be acted upon the colliding objects due to the third law of Newton, irrespective of the significance difference in mass of the objects. Similarly, they can also have different acceleration values during collision of two objects if the masses are identical.

But the statements regarding the equal change in velocity of two objects respectively involved in collision always is false, as the conservation of momentum is applicable for isolated system only. So it is true for only isolated system and not in all the systems.

The same reason goes for falsifying the fourth statement which states that total momentum is always conserved between two objects involved in a collision as this statement is only true for isolated system where the conservation of momentum can be applied. Thus the second and fourth statement is false regarding collision.

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3 years ago