What is an angular momentum and what is its SI unit?

Question

BlackTom AI · Accepted Answer

To tackle the question, I will examine what angular momentum means and what its SI unit should be.
Option a: 'The angular motion of a moment of inertia, the unit is kg.m2/s2' This statement incorrectly pairs angular motion with a moment of inertia and also gives the unit kg·m^2/s^2, which is actually the unit of torque or energy (depending on context), not angular momentum. The phrasing is imprecise and misleads about the relationship between inertia and angular motion.
Option b: 'The moment of inertia of an object moving at a constant angular velocity, the unit is rad/s' Here, the statement confuses a property (moment of inertia) with a description of the motion; it also lists the unit rad/s, which is an angular velocity unit, not angular momentum. The concept and the unit do not match.
Option c: 'The momentum of an object moving in rotational motion, the unit is kg.m2/s' This aligns with the standard definition of angular momentum: L is the rotational analog of linear momentum, defined for a body in rotational motion. The typical expression L = I ω or L = r × p leads to SI units of kilogram square meters per second (kg·m^2/s), which matches the unit given. This description correctly captures both the concept and the unit.
Option d: 'The angle of an object moving at a constant momentum, the unit is kg.m/s' This mixes angular measure (angle) with momentum and assigns an incorrect unit (kg·m/s is linear momentum; also angle is not a momentum measure). The idea conflates angular quantity with a non-rotational parameter, making it inaccurate.
Overall, only option c correctly describes angular momentum as the momentum associated with rotational motion and assigns the proper SI unit, kg·m^2/s, while the other options either misdefine the concept or provide inconsistent units.

UCIC 202503 PHYS101 Quiz 5

What is an angular momentum and what is its SI unit?

查看解析

登录即可查看完整答案

类似问题

Why does an ice skater spin faster when she folds her arms close to her body?

What is the equation to calculate an angular momentum for a particle and for a rigid object?

Angular momentum is:

A child swings a 0.38 kg ball in a circle on a string that is 1.3 m long. If the ball makes 1.2 rev/s, what is the magnitude of the ball's angular momentum?

An ice skater performs a fast spin by pulling outstretched arms down and close to her body. What happens to her angular momentum with respect to the axis of rotation?

Angular momentum is:

How much angular momentum must be supplied by the hamstrings to bring a leg swinging at 20 rad/s to a stop, given that the leg’s moment of inertia is 0.7 kg.m2? NOTE: SI unit symbols must be used and round to two (2) significant figures. This question is worth two (2) marks.

Because angular momentum must be conserved, as a gas cloud contracts, it will also

更多留学生实用工具

考试浏览器助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单