2. A car moves along a straight horizontal road with constant acceleration a\mathrm{m/s} where a{\gt}0The car is modelled as a particle.At time t=0, the car passes point A and is moving with speed u\mathrm{m/s^{-1}}In the first three seconds after passing A the car travels 2...
②Affish only moves along the river while a living fish can control its journey. 2018年重庆B卷 相关知识点: 试题来源: 解析 ②dead【解析】句意:一条死鱼只能沿河游动,而一条活鱼可以控制它的旅程。分析可知,空格所在句为“while”连接的并列分句。“while”表转折,故“A_fish^n与“a living fish”...
1 . A train car moves along a long straight track. The graph (曲线) shows the position as a function of time for this train. The graph shows that A . slows down all the time B . speeds up all the time C . speeds up part of the time and slows down part of the time D...
When something rolls,it moves along a surface,___many times.A.turning aroundB.turning over 相关知识点: 试题来源: 解析 B 【解析】A.turning around转身;B.turning over滚动;翻过来。根据句意"当某物滚动或当你滚动它时,它沿着一个表面移动,翻转很多次。"空处意思应该是"滚动;翻过来",B项正确。故选...
and \d v were correctly handled as in the solution for option (B), but an error was made in the integration by parts, where addition was used instead of subtraction, i.e.\int u\d v=uv+\int v\d u:\begin{split}\int _{1}^{e}x^{4}\ln x\d x&=\left.\dfrac {x^{5}}{5...
A train car moves along a long straight track. The graph (曲线) shows the position as a function of time for this train. The graph shows that ___. A. slows down all the time B. speeds up all the time C. speeds up part of the time and slows down part of the time D. moves ...
The train moves ___ along the tracks. A. slow B. slowly C. quick D. quickly 相关知识点: 试题来源: 解析 D。slow 和 quick 是形容词,不能修饰动词 moves,slowly 和 quickly 是副词,火车在轨道上行驶一般是快速地行驶,所以选 quickly。反馈...
A particle moves along a straight line. The graph of the particle's velocity v(t) at time t is shown above for 0≤q t≤q m, where j, k, l, and m are constants. The graph intersects the horizontal axis at t=0, t=k and t=m and has horizontal tangents at t=j and t=l. ...
The tram___along the track. A. is moving B. moves C. move D. is go 相关知识点: 试题来源: 解析 A。“The tram”是单数,正在发生的事情用现在进行时,is moving 符合现在进行时结构。B 选项 moves 是一般现在时;C 选项 move 形式错误;D 选项 is go 语法错误。反馈...
A particle moves along the -axis so that at any time , its position is given by . What is the speed of the particle at ? ( ) A. B. C. D. 相关知识点: 试题来源: 解析DSpeed is the absolute value of the velocity. Velocity is the first derivative of the position function. ...