Then in 1966 Donald Duck and his voice disappeared .That was

晓以心声2022-10-04 11:39:541条回答

Then in 1966 Donald Duck and his voice disappeared .That was___ there were no more new cartoons.
A what B how C why D because 为什么选D不选C啊?

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1998renmin 共回答了16个问题 | 采纳率93.8%: why得出的是结论,而because得出的事原因.根据前面的句子,前面那一句是结论,所以后面的句子应该是原因.; 1年前

A train at a constant 60.km/h moves east for 40.0min,then in A train at a constant 60.km/h moves east for 40.0min,then in a direction of 50.0 degree east of north for 20.0 minutes,and then west for 50.0 minutes.What are the a) magnitude and b) Angle of its average velocity during this trip? 翻译大概是这样? 1、一列火车以60千米/时的速度向东行驶了40分钟,然后向北偏东50度方向行驶了20分钟,然后向西行驶了50分钟. （1）速度的大小 （2）在旅途中平均速度速度的方向 宇宙071年前1: xxq106 共回答了17个问题 | 采纳率88.2%

sin(40)*60*2/6=sin(40)*20 km [竖的垂直距离]
cos(40)*60*2/6=con(40)*20 kn [横的水平向东距离]
60*2/3+cos(40)*20-60*5/6=cos(40)*20-10 [横的总距离]
（(cos(40)*20-10)^2 +(sin(40)*20)^2）^(1/2)=13.92km
tanx=(sin(40)*20)/(cos(40)*20-10)
所以,x=67.55度
40+20+50=110min,
13.92/(110/60)=7.6km/h

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A train at a constant 60.km/h moves east for 40.0min,then in A train at a constant 60.km/h moves east for 40.0min,then in a direction of 50.0 degree east of north for 20.0 minutes,and then west for 50.0 minutes.What are the a) magnitude and b) Angle of its average velocity during this trip? At one instant a bicyclist is 40.0m due east of a park’s flagpole,going south with a speed of 10.0m/s.Then 30.0 seconds later,the cyclist is 40.0m due north of the flagpole,going due east with a speed of 10.0m/s.for the cyclist in this 30.0s interval,what are the a) magnitude and b) Direction of the displacement. 我还是倔强的晓子1年前3: 功夫婆婆共回答了17个问题 | 采纳率100%

我物理不好,帮你翻译下吧.
1、一列火车以60千米/时的速度向东行驶了40分钟,然后向北偏东50度方向行驶了20分钟,然后向西行驶了50分钟.
（1）速度的大小
（2）在旅途中平均速度速度的方向
2、在某一时刻,一名自行车运动员在某停车场的旗杆40米向东处,以10米/秒的速度向南行进.30秒钟后,此人在旗杆正北40米处以每秒10米的速度向东星际.在这30秒的的间隔内,求
（1）位移的大小
（2）位移的方向

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