Escape Velocity and Gravitational Forces

<p>Mass of the escaping object does not affect the escape speed (C)</p> Signup and view all the answers

<p>At infinity (B)</p> Signup and view all the answers

<p>11.2 km/s (B)</p> Signup and view all the answers

<p>Gravity attracts two masses towards each other (C)</p> Signup and view all the answers

<p>GPE = mgh, where m is mass, g is gravitational field strength, and h is height (A)</p> Signup and view all the answers

<p>Weightlessness can happen during free fall where the object accelerates at the same rate as gravity (C)</p> Signup and view all the answers

<p>The distance from the center of the planet to the object (B)</p> Signup and view all the answers

<p>Enhanced immune system function (B)</p> Signup and view all the answers

<p>Total energy remains constant, though it can transform from one form to another (A)</p> Signup and view all the answers

<p>It increases or decreases. (A)</p> Signup and view all the answers

<p>688.1 N (A)</p> Signup and view all the answers

<p>The masses of the two bodies. (D)</p> Signup and view all the answers

<p>Mass of the object (B)</p> Signup and view all the answers

<p>Potential energy (A)</p> Signup and view all the answers

<p>Gravitational force increases with mass. (D)</p> Signup and view all the answers

<p>U2 - U1 = -GMm/(R+h) + GMm/R (A), U2 - U1 = GMm(-R + R + h)/R(R+h) (D)</p> Signup and view all the answers

<p>Gravity causes planets to orbit the Sun. (A)</p> Signup and view all the answers

<p>One can transform into the other. (D)</p> Signup and view all the answers

<p>√(2GM/R) (A)</p> Signup and view all the answers

<p>Kinetic energy and gravitational potential combine to total energy. (A)</p> Signup and view all the answers

<p>g = GM/r² (C)</p> Signup and view all the answers

<p>It quadruples. (B)</p> Signup and view all the answers

<p>ρ = 3gR²/4πG (D)</p> Signup and view all the answers

<p>The gravitational acceleration (C)</p> Signup and view all the answers

<p>g is a vector field towards the earth's center. (A)</p> Signup and view all the answers

<p>ω = 2πf = √(G/R³) (A)</p> Signup and view all the answers

<p>False (C)</p> Signup and view all the answers

<p>Potential energy at a point in a gravitational field (D)</p> Signup and view all the answers

<p>f = 1/T (A)</p> Signup and view all the answers

<p>It exerts no net gravitational force. (A)</p> Signup and view all the answers

<p>$F = GMm/R^3$ (A)</p> Signup and view all the answers

<p>$1.12 x 10^4$ m/s (C)</p> Signup and view all the answers

<p>$KE = rac{1}{2}mv^2$ (C)</p> Signup and view all the answers

<p>$ ho = rac{3M}{4 ext{π}R^3}$ (D)</p> Signup and view all the answers

<p>It decreases due to increasing mantle material. (B)</p> Signup and view all the answers

<p>Radius of the Earth. (A)</p> Signup and view all the answers

<p>It measures the resistance of a body to changes in its state of motion. (D)</p> Signup and view all the answers

<p>It results in no net gravitational force acting on particles inside. (A)</p> Signup and view all the answers

The minimum speed an object needs to escape the gravitational pull of a celestial body, like a planet or star, without additional propulsion.

The escape speed for an object depends solely on the mass of the celestial body it's escaping from.

The escape speed from Earth is approximately 11.2 kilometers per second.

The formula for calculating escape speed involves the gravitational constant (G), the mass of the celestial body (M), and the radius of the body (R): V = √(2GM/R)

The escape speed is the initial speed required for an object to move upwards forever and not fall back to the celestial body.

A fundamental force that attracts objects with mass towards each other.

Gravity is responsible for the phenomenon of objects falling to the ground.

Inside a uniform spherical shell, the gravitational force from the shell's mass is zero. This means that the force experienced by a particle inside the shell is only due to the mass enclosed within the sphere of radius r, where r is the distance of the particle from the center.

The kinetic energy of an object is the energy it possesses due to its motion. It's directly proportional to the object's mass and the square of its velocity.

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.

The force of gravity is not constant throughout the Earth. It increases as you move closer to the center of the Earth.

The escape speed of a rocket from the Earth is the minimum velocity the rocket must have at Earth's surface to escape Earth's gravitational pull and never return.

The kinetic energy required for a rocket to escape Earth's gravity is equal to half the product of its mass and the square of the escape speed.

The mass of an object is a measure of its inertia, which is its resistance to changes in its state of motion.

Energy associated with an object's position within a gravitational field.

The energy possessed by an object due to its motion. It depends on the object's mass and velocity.

The total mechanical energy of a system remains constant, meaning energy can be transformed from one form to another but the total amount stays the same.

The state experienced when there is no sensation of weight, resulting in a feeling of floating. This typically occurs in freefall or orbiting environments.

Force (F) acting on a mass (m) to produce an acceleration (a) is directly proportional to the mass and acceleration. Mathematically, F = ma, where F is measured in Newtons.

The gravitational force exerted on a body by the Earth, depending on the mass (m) of the body and the local acceleration due to gravity (g). It is calculated as W = mg.

The minimum speed an object needs to escape the gravitational pull of a celestial body, like a planet or star, without additional propulsion. It depends on the mass (M) of the celestial body and its radius (R).

The gravitational force follows an inverse square law: it decreases as the square of the distance (r) between the two bodies increases. Mathematically, F = -GMm/r² where G is the gravitational constant, M and m are the masses of the two objects, and r is the distance between them.

The energy stored in an object based on its position within a gravitational field. It depends on the object's mass, the acceleration due to gravity, and the height above a reference point.

Energy that can be converted to other forms of energy, such as work, heat, or light. It is the energy stored in an object due to its chemical composition or its position.

The conversion of potential energy into kinetic energy, and vice versa, in a gravitational field. For example, a falling object loses potential energy and gains kinetic energy.

The capacity to do work. It comes in various forms, including kinetic, potential, thermal, chemical, and more.

The gravitational potential at a point is the amount of work done per unit mass to move a body from infinity to that point.

The acceleration due to gravity, denoted by 'g', is the acceleration experienced by an object in free fall due to the Earth's gravitational pull.

The density of a substance is its mass per unit volume. For the Earth, it varies with depth. The core is denser than the crust.

The gravitational field strength at a point is the force per unit mass experienced by a test mass placed at that point.

The gravitational field strength is a vector quantity, meaning it has both magnitude and direction. It points towards the mass creating it.

The weight of a body is the force exerted on it by gravity. It depends on the body's mass and the local gravitational acceleration.

The total energy of a satellite in space is the sum of its gravitational potential energy (due to its position in the gravitational field) and its kinetic energy (due to its motion).

The escape speed for an object depends solely on the mass of the celestial body it's escaping from. The more massive the body, the higher the escape speed.