After the summer vacation started, Xiaomei and some classmates took a train to travel. When the train accelerated evenly on a straight track, Xiaomei said to the other classmates: "

Both of their methods can measure the acceleration of the train. The specific analysis is as follows:

(1) Xiaomei’s method: The acceleration of the small iron lock is the same as the acceleration of the train. Assume is a, and the angle between the plastic rope and the vertical direction is θ. As shown in Figure (a), the small iron lock is subject to two forces: gravity G and the tensile force T of the plastic rope. Assume the mass of the small iron lock is m. According to Newton's second law: mgtanθ=ma?①. From geometric knowledge, we get

tanθ=ds2?d2②,

solve ①② to get a=gds2?d2.

(2) Xiaolin’s method: As shown in Figure (b), assuming the acceleration of the train is a′, it passes two consecutive three telephone poles A, B, and C 100m apart. The times are t1 and t2, and the average speed of the train between AB and BC are v1=100t1 and v2=100t2 respectively.

From the inference of uniformly variable linear motion, it can be seen that the instantaneous speed of the train at the intermediate moment during these two periods is v1 and v2 respectively,

And the speed between these two moments Time is △t=t1+t22,

then a′=△v△t=200(t1?t2)t1t2(t1+t2).

So the answer is: Yes, a=gds2?d2; a′=200(t1?t2)t1t2(t1+ This answer is recommended by the questioner. It has been liked and disliked. Your evaluation of this answer is ? Comments are closed // High quality or satisfactory or special type or recommended answer time window.iPerformance && window.iPerformance.mark('c_best', +new Date); Recommended lawyer service: If your problem is not solved, please Describe your problem in detail and get free professional consultation through Baidu Lulin. The services you may need. Baidu Lulin official certified lawyer consultation has an average response of 3 minutes | problem resolution rate 99% | 24 hours online free consultation with lawyers immediately. 13,449 people are getting a pair 1 Answer Hefei Cloud Walk submitted a question 2 minutes ago Harbin Ice and Snow Adventure submitted a question 1 minute ago Wuhan Prairie Wind submitted a question 1 minute ago Other similar questions 2013-12-04 After Xiao Ming and Xiao Ying separated on the train platform, Walking in the opposite direction along the railway track, at this time, a train came towards Xiao Ming at a constant speed. The train arrived during Xiao Ming's 352017-09-15 holiday. Several classmates in the class sent Xiao Ming home by train, as shown in the picture. , several classmates watched the train slowly moving, Xiao Ming was sitting by the window, but 242016-11-18 Some students took the high-speed train to travel. When the train was speeding up evenly on a straight track, a classmate suggested: "Can we use the 32016-07-09 Xiao Ming to travel during the summer vacation? When he took the train, he found that every time he passed the joint of two rails, he heard a crash. He also found that before the train entered the cave, 52014-12 -06 Xiaoqiang, Xiaofang, and Xiaoliang were on an outing. After seeing a train passing through a tunnel at a constant speed in the distance, the following dialogue occurred. Dear students, please follow their 22011-06-24 During the May Day period, Xiaohua and his family took a ride. Train travel.

He did four simple experiments in a carriage that moved horizontally and in a straight line at a constant speed. 72014-11-18 Xiaohong, Xiaonan, and Xiaofang were on an outing. After seeing a train passing through a tunnel at a constant speed in the distance, the following dialogue occurred. Xiaohong : The train enters the tunnel from the beginning 42016-10-04 During the May Day holiday, Xiaohua’s family took a train to travel. He conducted four simple experiments in a carriage moving in a straight line at a uniform speed. The following situations are consistent with reality. 2 More similar questions?>Answer the lawyer's question yet? Ask a lawyer immediately 38,223 online lawyers 3 minutes response time 99% problem resolution rate Submit a question Lawyer call back to get an answer Consult a lawyer immediately for free Hefei Cloud Walk Submitted a question 2 minutes ago Recommended for you F.context('recBrand',[{"img" :"\/86d6277f9e2f07083523f69dfb24b899a901f20d?x-bce-process=image%2Fresize%2Cm_lfit%2Cw_450%2Ch_600%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_auto","url":"/hm.js? 6859ce5aaf00fb00387e6434e4fcc925"; var s = document .getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); window.tt = 1722370962;