what is the difference between particle speed and wave speed

相关推荐

• 关于飞机发动机推力的问题.我是一名新机务,有一个问题需要问：当飞机的速度增大,推力减少.这是怎么回事?我认为应该是增大啊!原句是这样的：（英文版）When the speed of the aircraft increases,the thrust decreases,because the difference between the outlet velocity and the inlet velocity of the airflow decreases when the speed of the aircraft increases.Another factor of the airspeed causes an opposite change on the generated thrust.When the aircraft moves through the air,the airflow that is rammed into the engine inlets increases
• 8.The waves are observed by a child sitting in a rowboat offshore.Which of the following properties of the waves seen by the child would be greater when the boat is moving away from the beach than when the boat is stationary with respect to the beach?I.Speed of the waves with respect to the boatII.Frequency at which the boat encounters successive wave crestsIII.Distance between adjacent wave crests(A) I only(B) III only(C) I and II only(D) II and III
• 提问几道GRE数学题!都是绿皮上的,本人数学不大好,P275.39In how many of the integers between 1 and 100 does the digit 5 occur exactly once?答案是18,题目啥意思,如何做?P231.2A train travels 60 miles per hour for 3 hours and then 45 miles per hour for 2 hours.What is the train's average speed in miles per hour during the 5-hour period?P246.17A teacher has a total of at least 110 students enrolled in her classes.If the teachers has an average of exactly 27 students enrolled per class,what
• Nigel left home at 12.10 p.m.and walked to his grandmother's house.He walked at an average speed of 95m/min.He arrived at 12;25 p.m.What is the distance between his house and his grandmother's house?给个翻译和答案,3Q
• 英语翻译求翻译,机器翻的不要.文章长了点,如果嫌麻烦不一定每个词都要译出来,但每句话的意思基本要准确,当然,如果能翻得详细那就更好了,呵呵,在此谢过各位英语达人~In business,there is a speed difference:It's the difference between how important a firm's leaders say speed is to their competitive strategy and how fast the company actually moves.The difference is important regardless of industry and company size.Companies fearful of losing their competitive advantage spend much time and money looking for ways to pick up the speed.In o
• 大学物理机械波有关题目,英文版.The speed of sound in air at 20 is 344m/s.(A 部分中的波长为0.439m）What is the wavelength of a sound wave one octave higher than the note in part 题目真心看不懂,
• what is the difference between particle speed and wave speed
• 根据所给释义和首字母提示,写出下列单词1.the time now passing p_______2.give or offer help without being paid v_________3.get/gain knowledge or skill from seeing and doingthings e____________4.a person belonging to group ,society,etc.m_______5.needing or being ready to go to sleep s______6.get something done ; or complete something a_____7.contset of speed between runners r_______8.give an answer in speech or writing r________9.to do what you are told or expected to do o
• 设A={平行四边形},B={矩形},C={菱形},D={正方形},那么
• 初三化学兴趣小组在调查一化工厂是,发现有个车间排出的废水澄清透明呈蓝色