Physics

Gravitation and Center of Mass

368 Questions

Gravitation and center of mass questions explore gravitational fields, planetary density, and the mechanics of celestial bodies. Test items include calculating gravitational strength on different planets and understanding the Roche Limit. This topic is essential for the physics syllabus of major competitive exams.

Gravitational fieldCenter of massPlanetary densityHill SphereSpace-time curvature

Gravitation and Center of Mass Questions

Multiple choice

What was the mass of the two neutron stars involved in the GW170817 event?

  1. 1.4 solar masses and 2.6 solar masses

  2. 1.1 solar masses and 1.6 solar masses

  3. 0.9 solar masses and 1.3 solar masses

  4. 0.7 solar masses and 1.0 solar masses
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The mass of the two neutron stars involved in the GW170817 event was 1.4 solar masses and 2.6 solar masses.

Multiple choice

The gravity model is used to model the interaction between two or more locations. The strength of the interaction is directly proportional to the product of the masses of the locations and inversely proportional to the square of the distance between them. Which of the following is an example of a gravity model?

  1. The migration of people from rural to urban areas

  2. The flow of goods from one country to another

  3. The spread of a disease from one person to another

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The gravity model can be used to model a variety of interactions between two or more locations, including the migration of people, the flow of goods, and the spread of disease.

Multiple choice

The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The equation for the force of gravity is:

  1. F = Gm1m2/r^2

  2. F = Gmr^2

  3. F = mg
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. The equation for the force of gravity is F = Gm1m2/r^2, where G is the gravitational constant, m1 and m2 are the masses of the two objects, and r is the distance between them.

Multiple choice

What is the relationship between the frequency of a gravitational wave and the mass of the objects that produce it?

  1. The frequency is proportional to the mass

  2. The frequency is inversely proportional to the mass

  3. The frequency is independent of the mass

  4. The frequency is proportional to the square of the mass
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The frequency of a gravitational wave is proportional to the square of the mass of the objects that produce it.

Multiple choice

According to general relativity, what is the relationship between mass and the curvature of space-time?

  1. Mass causes space-time to curve

  2. Space-time causes mass to curve

  3. Mass and space-time are independent

  4. Mass and space-time are inversely proportional
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

According to general relativity, mass causes space-time to curve.

Multiple choice

What is the estimated value of the resources contained in a single near-Earth asteroid?

  1. Billions of dollars

  2. Trillions of dollars

  3. Quadrillions of dollars

  4. Incalculable
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Estimates of the value of resources in a single near-Earth asteroid vary, but some studies suggest that it could be worth trillions of dollars.

Multiple choice

How does the Earth's axial tilt affect the Earth's tides?

  1. It causes the Earth's tides to be higher at the poles and lower at the equator.

  2. It causes the Earth's tides to be lower at the poles and higher at the equator.

  3. It causes the Earth's tides to be the same at all latitudes.

  4. It causes the Earth's tides to be different at different latitudes.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Earth's axial tilt causes the Earth's tides to be different at different latitudes, resulting in higher tides in some regions and lower tides in others.

Multiple choice

What is the Lagrange points of an object?

  1. The points in space where the gravitational forces of two objects cancel each other out

  2. The points in space where the magnetic forces of two objects cancel each other out

  3. The points in space where the radiation forces of two objects cancel each other out

  4. The points in space where the atmospheric forces of two objects cancel each other out
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Lagrange points of an object are the points in space where the gravitational forces of two objects cancel each other out, allowing an object to remain in a stable orbit around both objects.

Multiple choice

Which of the following is not a factor that affects the Earth's argument of perihelion?

  1. The gravitational influence of Jupiter

  2. The gravitational influence of Saturn

  3. The gravitational influence of Mars

  4. The Earth's rotation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Earth's rotation is not a factor that affects the Earth's argument of perihelion.

Multiple choice

Which of the following is not a factor that affects the Earth's argument of perihelion?

  1. The gravitational influence of Jupiter

  2. The gravitational influence of Saturn

  3. The gravitational influence of Mars

  4. The Earth's rotation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Earth's rotation is not a factor that affects the Earth's argument of perihelion.

Multiple choice

In the two-body problem, the force between the two bodies is:

  1. Gravitational

  2. Electromagnetic

  3. Nuclear

  4. Weak
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The force between two bodies in the two-body problem is gravitational, as described by Newton's law of universal gravitation.

Multiple choice

The two-body problem can be solved exactly when the force between the two bodies is:

  1. Inverse-square law

  2. Linear

  3. Exponential

  4. Logarithmic
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The two-body problem can be solved exactly when the force between the two bodies is an inverse-square law, such as the gravitational force.

Multiple choice

The center of mass of a two-body system is:

  1. The point where the two bodies meet

  2. The point where the gravitational force between the two bodies is zero

  3. The point where the two bodies have equal masses

  4. The point where the two bodies have equal momenta
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The center of mass of a two-body system is the point where the two bodies have equal momenta.

Multiple choice

What is the approximate density of the Earth's core?

  1. 12-13 g/cm³

  2. 10-11 g/cm³

  3. 8-9 g/cm³

  4. 6-7 g/cm³
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's core has a density of approximately 12 to 13 g/cm³.

Multiple choice

What is the specific gravity of ice cream?

  1. 0.5-0.6

  2. 0.7-0.8

  3. 0.9-1.0

  4. 1.1-1.2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The specific gravity of ice cream is 0.9-1.0.