1.
The total angular momentum of an object remains constant unless acted upon by an external
Correct Answer
A. Force
Explanation
The total angular momentum of an object remains constant unless acted upon by an external force. This means that if there are no external forces acting on the object, the total angular momentum will remain the same. Angular momentum is a measure of the rotational motion of an object and is determined by its mass, shape, and rotational speed. If an external force is applied to the object, it can change the object's angular momentum by causing it to accelerate or decelerate its rotational motion. Therefore, force is the correct answer as it is the external factor that can affect the total angular momentum of an object.
2.
Angular momentum is what type of quantity?
Correct Answer
A. Vector
Explanation
Angular momentum is a vector quantity because it has both magnitude and direction. It is the rotational equivalent of linear momentum and depends on the position, mass, and velocity of an object rotating around an axis. The direction of the angular momentum vector is perpendicular to the plane of rotation and follows the right-hand rule. Therefore, it can be represented by a vector arrow pointing along the axis of rotation.
3.
Angular momentum is the product of inertia and
Correct Answer
B. Angular velocity
Explanation
Angular momentum is a measure of the rotational motion of an object. It is defined as the product of the moment of inertia and the angular velocity of the object. Moment of inertia represents how mass is distributed around the axis of rotation, while angular velocity measures the rate at which an object rotates around that axis. Therefore, the correct answer is angular velocity, as it is directly related to the angular momentum of the object.
4.
Angular momentum is usually denoted by
Correct Answer
B. L
Explanation
The correct answer is L. Angular momentum is usually denoted by the symbol L. This symbol is commonly used in physics to represent the rotational motion of an object. It is a vector quantity that depends on the mass, velocity, and distance from the axis of rotation. The symbol M is typically used to represent mass, A is used for acceleration, and K is often used for kinetic energy. Therefore, L is the correct symbol for angular momentum.
5.
Angular momentum exhibits which type of motion?
Correct Answer
D. Rotational
Explanation
Angular momentum exhibits rotational motion. In physics, angular momentum is a vector quantity that represents the rotational inertia of an object in motion. It depends on both the mass of the object and its rotational velocity. When an object is rotating about an axis, it possesses angular momentum, which is a measure of its tendency to continue rotating. This type of motion is distinct from translational motion, which involves movement along a straight path, as well as other types of motion like rectilinear (motion along a straight line) and harmonic motion (repetitive motion back and forth around a central position). Therefore, angular momentum specifically pertains to rotational motion.
6.
Both angular velocity and inertia of moment must be at the same rotational line and
Correct Answer
A. Axis
Explanation
Angular velocity and inertia of moment must be at the same rotational axis because angular velocity is a vector quantity that describes the rate at which an object rotates around an axis, while inertia of moment is a scalar quantity that measures an object's resistance to changes in its rotational motion around a specific axis. Therefore, both quantities need to be referenced to the same axis in order to accurately describe the rotational motion of an object.
7.
The formula for angular momentum is
Correct Answer
A. L = IW
Explanation
The formula for angular momentum is L = IW. This equation represents the relationship between angular momentum (L), moment of inertia (I), and angular velocity (W). It states that the angular momentum of an object is equal to the product of its moment of inertia and angular velocity. This equation is derived from the fundamental principles of rotational motion and is used to calculate and understand the rotational behavior of objects.
8.
Which of the following laws explains that angular moment is conserved in an orbit?
Correct Answer
B. Kepler 's law
Explanation
Kepler's law explains that angular momentum is conserved in an orbit. Kepler's laws of planetary motion describe the motion of planets around the sun. The second law states that the line connecting a planet to the sun sweeps out equal areas in equal times, which implies that the planet's angular momentum is conserved. This means that as a planet moves closer to the sun, it speeds up to maintain a constant angular momentum, and as it moves farther away, it slows down. Therefore, Kepler's law is the correct answer to the question.
9.
Angular momentum belongs to which groups?
Correct Answer
A. Derived quantities
Explanation
Angular momentum is a physical quantity that is derived from other fundamental quantities such as mass, velocity, and distance. It is not a fundamental quantity itself, like force or scalar quantities. Therefore, it belongs to the group of derived quantities.
10.
Angular momentum has both magnitude and
Correct Answer
B. Direction
Explanation
Angular momentum is a vector quantity, which means it has both magnitude and direction. The magnitude of angular momentum represents the amount of rotational motion an object possesses, while the direction indicates the axis around which the rotation occurs. Therefore, the correct answer is "direction."