小胖看见闪电后,过了5.2秒才听到雷声.已知雷声在空中传播的速度是0.33千米/

题型:解答题

问题:

小胖看见闪电后,过了5.2秒才听到雷声.已知雷声在空中传播的速度是0.33千米/秒.闪电的地方离小胖有多远?

考点:整数,小数,分数,百分数和比例的复合应用题
题型:解答题

质量为5 kg的小球以5 m/s的速度竖直落到地板上,随后以3 m/s的速度反向弹回去,若取竖直向下的方向为正方向,则小球动量的变化为[ ]

A.10 kgm/s  

B.-10 kgm/s

C.40 kgm/s  

D.-40 kgm/s

题型:解答题
用方框内的单词完成下面的句子(有多余选项)。
  
always, every day, often, sometimes, never, hardly ever
1. He_____ gets up at six o'clock, seven days a week.
2. How_____ do you go to the movies?
3. It _____ _____ rains here. It's usually sunny and warm.
4. Some of my friends exercise every day and hardly ever eat junk food, but most of them eat junk food
  _____ .
5. I can't swim. So I _____ go to the beach to swim. Sometimes I go there with my friends to run.
题型:解答题

电工纯铁一般只用于()磁场。

A.交流 

B.旋转 

C.直流 

D.任意

题型:解答题

物体在平面上滑动,滑动摩擦系数是()与摩擦系数之积。

题型:解答题

596×188-5.96×2400-0.596×64000=()。

A.58600

B.59600

C.59500

D.58500

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