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Which statement is true about the variables that affect the force of gravity between two objects?

options:

Force of gravity is affected by the masses of the objects and the distance between their outermost edges.
Force of gravity is affected by the masses of the objects and the distance between their outermost edges.

Force of gravity is affected by the volume of the objects and their velocity relative to the Sun.
Force of gravity is affected by the volume of the objects and their velocity relative to the Sun.

Force of gravity is affected by the diameters of the objects and their distance from the Sun.
Force of gravity is affected by the diameters of the objects and their distance from the Sun.

Force of gravity is affected by the masses of the objects and the distance between their centers.

11 answers

The correct statement is:

Force of gravity is affected by the masses of the objects and the distance between their centers.

This is based on Newton's Law of Universal Gravitation, which states that the gravitational force between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Janice holds two negatively charged balloons near each other. What will happen with the balloons?

options:

The balloons will be attracted to each other.
The balloons will be attracted to each other.

The balloons will not move.
The balloons will not move.

The balloons will push away from each other.
The balloons will push away from each other.

The balloons will become neutral.

The correct statement is:

The balloons will push away from each other.

Since both balloons are negatively charged, they will experience a repulsive force and will move away from each other. Like charges repel, while opposite charges attract.

What force can be produced with an electrical current?'

options:

Potential
Potential

Magnetic
Magnetic

Nuclear
Nuclear

Chemical

The correct answer is:

Magnetic.

An electrical current produces a magnetic force, as described by Ampère's circuital law and the principles of electromagnetism. When an electric current flows through a conductor, it generates a magnetic field around it.

If the mass of planet Earth doubled, how would the force of gravity between Earth and the Sun change?

options:

The force of gravity would decrease by half
The force of gravity would decrease by half

The force of gravity would not change
The force of gravity would not change

The force of gravity would double
The force of gravity would double

The force of gravity would increase four times

The correct answer is:

The force of gravity would double.

According to Newton's Law of Universal Gravitation, the force of gravity \( F \) between two masses \( m_1 \) and \( m_2 \) separated by a distance \( r \) is given by the formula:

\[ F = G \frac{m_1 m_2}{r^2} \]

If the mass of Earth \( m_1 \) doubles (while the mass of the Sun \( m_2 \) and the distance \( r \) remain constant), the gravitational force \( F \) will also double.

A student rubs a balloon made of rubber on his hair and notices that the balloon sticks to his hair afterwards. What happened to the electrical charges of both the student’s hair and the balloon?

options:

The balloon’s charge became negative, and the hair’s charge became positive
The balloon’s charge became negative, and the hair’s charge became positive

The balloon’s charge became negative, and the hair’s charge became negative
The balloon’s charge became negative, and the hair’s charge became negative

The balloon’s charge became neutral, and the hair’s charge became positive
The balloon’s charge became neutral, and the hair’s charge became positive

The balloon’s charge became positive, and the hair’s charge became positive

The correct answer is:

The balloon’s charge became negative, and the hair’s charge became positive.

When the student rubs the balloon on his hair, electrons are transferred from the hair to the balloon. This results in the balloon gaining extra electrons and becoming negatively charged, while the hair loses some electrons and becomes positively charged. This difference in charge creates an attractive force between the balloon and the hair, causing the balloon to stick to the hair.

A student touches a rubber ball with a negatively charged plastic rod. How will the negative charges be distributed on the ball?

options:

Evenly distributed on the ball’s surface
Evenly distributed on the ball’s surface

On the bottom of the ball’s surface
On the bottom of the ball’s surface

On the ball’s surface where the rod touches the ball
On the ball’s surface where the rod touches the ball

Evenly distributed on the ball’s inside

The correct answer is:

Evenly distributed on the ball’s surface.

When the negatively charged plastic rod touches the rubber ball, electrons from the rod are transferred to the ball, making the entire ball negatively charged. Because like charges repel and the charges are free to move, they will spread out evenly across the surface of the ball, resulting in an even distribution of negative charges.