初一下册第4章 自然界中的运动
Quiz
•
Physics
•
7th - 9th Grade
•
Practice Problem
•
Medium
KHOO XUEMEY
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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
同步通信卫星是无线电波传播的中继站,这类卫星虽绕地心转动,但我们却觉得它在空中静止不动,这是因为观察者所选择的参照物是______。
地球
卫星
太阳
月球
2.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
油罐车在路上行驶,选车头为参照物,静止的是______。
司机
行人
路边的树木
地面
3.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
关于速度的说明,错误的是_____。
速度是物体在单位时间内通过的位移
国际单位是米每秒
公式为v = t / s
运用速度公式进行计算时,三个物理量的单位必须统一
4.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
1 m/s = _____ km/h
1
2.8
3.6
1000
5.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
90 km/h= _____ m/s
25
30
270
324
6.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
物体由于运动而具有的能叫做_____。
势能
动能
机械能
化学能
7.
MULTIPLE CHOICE QUESTION
30 sec • 5 pts
物体由于被举高或由于形变而具有的能叫做_____。
势能
动能
机械能
化学能
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