甲物体具有动量大小为P,动能为.乙物体具有动量大小为P/2,动能

甲物体具有动量大小为P,动能为.乙物体具有动量大小为P/2,动能为3.则   A.要使它们在相同的时间停下来,应对甲施加较大的阻力

B.如果受的阻力相同,乙运动的时间较长

C.甲的速度大

D.甲的质量小

 

答案

A

  


解析:

相关题目

His mother had thought it would be good for his character to _____from home and
His mother had thought it would be good for his character to _____from home and earn some money on his own.   A. run away           B. take away          C. keep away       
 — What is his telephone number?— Sorry, I don’t ________.   A. think 
 — What is his telephone number?— Sorry, I don’t ________.   A. think             B. meet        C. find               D. know
 Knowing what colors look good _______ your skin is of great importance when y
 Knowing what colors look good _______ your skin is of great importance when you buy clothes.     A. beyond          B. within               C. against         
 My house is the only brick one on the street. It _____ and you can't miss it.
 My house is the only brick one on the street. It _____ and you can't miss it. A. stands up         B. looks out             C. sticks out             D. wipes o
You don't have to share the umbrellas. I'll give you one_____. A.every     
You don't have to share the umbrellas. I'll give you one_____. A.every        B.each   C.all  D.both
图14中AB为晨昏线的一部分,A为晨昏线上纬度最高点,C和D 在
图14中AB为晨昏线的一部分,A为晨昏线上纬度最高点,C和D 在同一纬线上,A、C、D三点所差经度数相同,此时地球公转速度 较慢。读图回答下列问题。
《国际歌》是法国的欧仁·鲍狄埃在1871年5月创作的,与这首
《国际歌》是法国的欧仁·鲍狄埃在1871年5月创作的,与这首歌的创作背景联系最为  紧密的历史事件是         (    ) A.《共产党宣言
This ____________ girl is Linda's cousin. A. pretty little Spanish       
This ____________ girl is Linda's cousin. A. pretty little Spanish              B. Spanish little pretty C. Spanish pretty little              D. little pretty Spanish  

最新题目