相关知识点: 试题来源: 解析 C。解析:时间等于路程除以速度,200÷50 = 4 小时。A 选项路程计算错误。B 选项路程计算错误。D 选项路程计算错误。本题考查行程问题,英语阅读技巧是理解关键词 constant speed、kilometers per hour 的含义。反馈 收藏
A cyclist is pedaling at a constant speed. This is an example of _. A. accelerated motion B. decelerated motion C. uniform motion D. irregular motion 相关知识点: 试题来源: 解析 C。一个骑自行车的人以恒定的速度骑行,这是匀速运动的一个例子。A 选项加速运动;B 选项减速运动;D 选项不规则...
Increasingly,our world is being designed by machines,for machines.We adapt to machines and hold ourselves to their standards:People are judged by the speed with which they respond,not the quality of their response.Such ideas are being woven into our culture. "Always on" beco...
aThe planes moving at a constant air speed thus go faster in the west-east direction when they are moving with the wind than in the opposite direction. 当他们移动与风比在相反方向时,移动以一张恒定的气流速度的飞机在西部东部方向快速地因而进。[translate]...
A train is passing by a platform at a constant speed of40m/s. The train horn is sounded at a frequency of378Hz. Find the overall change in frequency as detected by a person standing on the platform, as the train moves from approaching to receding. (Take velocity of sound in air as32...
A train travelling at constant speed takes five seconds to pass completely through a tunnel which is 85 m long, and eight seconds to pass completely through a second tunne which is 160 m long. What is the speed of the train? 相关知识点: 试题...
A speeder traveling at a constant speed of 100 km/hr passes a waiting police car that immediately starts from rest and accelerates at a constant 2.5 m/s^2 How long will it take for the police car to catch the speeder?A 22.2 sB 23.3 sC 24.8 sD 21.4 sE 25.1 sF 20.2 s 相关知识点...
A cyclist rides a bike at a constant speed of 15 kilometers per hour. If the cyclist completes one lap around a city park, is that distance less than 800 meters? (1 kilometer = 1,000 meters)
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Answer to: A bicyclist travels at a constant speed of 7 m/s. What is the total mass of the bicycle and the boy when the total momentum is 490...