英语翻译

题目

英语翻译
(30)In everyday life,we use the terms speed and velocity interchangeably可互换,but in physics there is an important distinction between them.Speed depends on the distance traveled,and velocity on the displacement.Speed is the distance traveled by a particle in unit time.If a particle travels identical distances during equal time intervals,its motion is called uniform.In this case,the speed of the particle at each moment can be calculated by dividing the distance by the time .
(31)Forces of friction are typical non-conservative ones.Since the force of friction and the velocity of a particle are directed oppositely,then the work of the force of friction on each part of the path is negative:Therefore,the work along any closed path will also be negative.Hence it follows that the forces of friction are not conservative.
(32)The object of the molecular-kinetic theory is to interpret解释 the properties of bodies that are directly observed in experiments (pressure,temperature,ect)

答案

30)在日常生活中,我们使用用语速度和速度interchangeably可互换,但是在物理有他们之间的重要分别.速度取决于距离移动了和在位移的速度.速度是距离由在单位时间的一个微粒移动了.在相等的间隔时间期间,如果微粒移动相...