[VẬT LÝ 12] Chữa test nâng cao dao động cơ số 02 - Thầy VNA

Today, Mr. Ngoc Anh will treat you to raise the bar 1, number 02 The number 01 has been treated for you, right? The number 01 does not remember exactly how many people took the exam Our number 02 has more than 550 participants After a while, there will be a score for you to compare The 1st test is only for 1 person to get 10 out of 10 And this test, let's see how many you get There are 10 questions in total You get 2 out of 10 Let's start Mr. Do, please show the question number 1 What is the answer to our question number 1? Wait, wait, wait You guys comment the answer to question 1 I have to share the wall a little bit I have to share all kinds of questions I forgot Just ask the students to share and I haven't shared yet I forgot, forgot, forgot Wait a minute 30 seconds You guys comment the answer to question 1 I forgot Just ask the students to share and I haven't shared yet So, question 1 What is the equation of a constant moving object with the equation x equal to a cos? Right? PFT See? There What is the average speed of an object in a century? You guys remember If people ask what is the average speed of an object in a century The average speed is 0 Right? But for the average speed, you have to divide by time The average speed is the degree of time divided by time Got it? Right? But if people ask what is the average speed of an object in a century You will be fooled Question 1 What is the answer? Let's see how many of you can get the answer to question 1 Getting the answer to question 1 is not that easy Question 1 Some of you got B Some of you got D Right? I will write it down Average speed V average Right? See? The average speed is the degree of time divided by time The degree of time in a century is 4a What is the time? Time is a A century t And the average speed is the degree of time divided by time I will choose the average speed later Got it? See? A century t is equal to 2P divided by omega Right? If you do the opposite, you will get 2 times A times omega And divided by what? Divided by P Now, how much is omega? Remember that omega is everything times T Right? So we will get 2 times A times PF Right? Now, our omega is PF You divide P by P Right? It's 2 times A times PF See? Omega is everything times T It's the denominator of T It's PF Got it? Ok So what is our answer for this question? Our first question The answer is 2 times A times PF The answer is D It's correct Got it? How many questions did we get? We got 1 question Got it? Ok Why did I get 1 question wrong? Ok, let's move on to the second question See? Oh, 2K4 is so crowded this morning 597 people I will show you the highest record Please take a picture of me I can't be noticed when I wake up Wow, 609 people So crowded Why did I press my car's button? So crowded Ok, the second question The second question is a bit harder A bit harder But it's still an easy question Let's see One object is made at the same time Two oscillators There Equal to the x1 and x2 equations They give you a condition It's 4x1 See? 4x1 plus 9x2 Equals 36 Right? So this equation It's an equation After people have changed People have changed Then people have cut the pendulum Right? So you have to take it back Its general equation Just look at it You will know This is the general equation of the pendulum I will convert it It's x1 Right? Divide by 36 It's 6 4 is 2 How much is it? 36 divided by 4 It's 9 Right? So it's 3 x1 Divide by 3 Right? Plus x2 36 divided by 9 How many grams? And 4 It's 2 Right? Equals 1 So now you know The general equation of x1 and x2 The general equation of the pendulum It's x1 squared over a1 squared Plus x2 squared over a2 squared Equals 1 Right? So from here From this equation You have to learn 3 things Right? It's 1 and 2 It's 2 pendulums They are mixed together See the symbol The pendulum is mixed with this symbol Use this symbol Right? These 2 pendulums are mixed together And our a1 is 3 Our a2 is 2 Right? The symbol below is a1 squared and a2 squared Then because 2 pendulums are mixed together The total amplitude is our a12 It's Pythagorean The weight of a1 squared plus a2 squared 9 plus 4 is 13 So this pendulum The result is 13 cm And the weight of 13 cm You can see on the screen Our answer is a Right? See? It's quite heavy d And a See? Right? Is this answer a? Pay attention to my record I don't know how many records I have I don't know Right? The 3rd question The 3rd question seems to have a lot of arguments The 3rd question is called The classic time in Jiao Dou Guys The 3rd question is called The classic time in Jiao Dou The 3rd question What is your answer? Right? The 3rd question Some of you answer D Some of you answer A Right? Duy Tien answer A Tai Nguyen answer C Do Tien Xuan answer A Tuan Hiep answer C So What is the difference between A and C? An object moving with the x-axis Equal to A plus Pt plus Phi It always has our omega Equal to Pi See? Omega by Pi We get the second order Equal to 2 seconds Are you done? So The second order It is like this At T1 The momentum is 30 mJ At T2 At 0.6 seconds The momentum is 40 mJ It requires us to find the function of the object So now Many of you will It will be confusing 3, 4, 5 is the square Then 3, 4, 7 is the total Oh my god So look Look We got 0.1 and 0.6 seconds Separate is 0.5 seconds yet? 0.5 seconds of you Is 1 quarter of the period 1 quarter of the period It appears in the form of a square yet? That is, at T1 It will be square with the time T2 Right? At T1 It will be square with the time T2 So from here I got 2 times square with each other The momentum at 2 times is square with each other V1 plus V2 V2