Physics question, upload 唔到圖，please help～?
2016-12-08 9:07 pm
有一個graph，一條直線打斜上.個x-axis represents t-square/s-square，y-axis represents K.E./J.踮住0開始斜上，4個coordinations，first one（2，6000），second one（4，12000）,third one(6,18000),last one 即最高個點(6.4,19000).Question: A are of mass1500kg is accelerating from rest along a straight road. What is the acceleration of the car?
回答 (1)
2016-12-09 12:26 am
因為動能=(0.5)(物件重量)(速度)^2
已知y-axis=(slope of graph)(x-axis)+(x-intercept)-->y=mx+c
slope=(19000-6000)/(6.4-2)=2954.55=2950
(0.5)(1500)(v^2)=2950(t^2)
(v^2)=3.94(t^2)
square root the equation
v=1.98t
已知一個v-t graph,acceration=slope,base on y=mx+c
因此acceleration=1.98
已知y-axis=(slope of graph)(x-axis)+(x-intercept)-->y=mx+c
slope=(19000-6000)/(6.4-2)=2954.55=2950
(0.5)(1500)(v^2)=2950(t^2)
(v^2)=3.94(t^2)
square root the equation
v=1.98t
已知一個v-t graph,acceration=slope,base on y=mx+c
因此acceleration=1.98
收錄日期: 2021-04-11 21:49:11
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20161208130717AAdQ5uH