问题 填空题

神舟十号飞船与天宫一号对接时要完成数百个动作,是通过喷射燃气来实现变轨(改变运行高度,运行方向),这说明力可以              ;北京测控中心通过      与宇航员联络,当神舟十号绕远地点向近地点运动时其动能     (选填“增大”“缩小”或“不变”)

答案

改变物体的运动状态;电磁波;增大

题目分析:①力的作用效果有二:改变物体的形状,改变物体的运动状态,其中运动状态的改变包括速度的变化和方向的变化;

②电磁波可以在真空中传播;

③飞船在绕地飞行过程中,动能和重力势能不断转化.

①神舟十号飞船与天宫一号对接时要完成数百个动作,是通过喷射燃气来实现变轨(改变运行高度,运行方向),这说明力可以改变物体的运动状态;

②北京测控中心通过电磁波与宇航员联络;

③当神舟十号绕远地点向近地点运动时,重力势能转化为动能,质量不变,速度变大,所以动能增大.

点评:此题考查的是力的作用效果、电磁波的特点和动能的影响因素,属于基本规律的应用,难度不大

单项选择题
补全对话,情景问答
从Ⅱ中找出与Ⅰ相对应的句子。
Ⅰ                                             
( )1. Let's play soccer.                        
( )2. Do you have 70 tennis at school?              
( )3. Do they like watching TV?                  
( )4. Does Eddy like sports?                      
( )5. Do you and your friend play soccer every day? 
( )6. I'm sorry I can't play tennis.               
( )7. How many baseballs do you have?.             
( )8. Where's your ping-pong bat, please?           
( )9. Do you like computer games?.                  
( )10. What's favorite sport?                       
Ⅱ                                         
A. Yes, they do.                           
B. No, he doesn't.                         
C. No, we don't.                           
D. Great! That sounds fun.                 
E. No, I have sixty.                       
F. I like both soccer and ping-pong.       
G. It's in my backpack.                    
H. Yes, it's interesting.                  
I. Don't worry, it's easy, let me teach you.
J. Only one.