题干

一辆汽车质量m=1×103kg,在水平路面上由静止开始做直线运动,所受阻力恒定不变,牵引力F与车速的倒数
1
v
的关系如图所示,则汽车在BC段的运动为____.若发动机的最大牵引力为3×103N,最大输出功率Pm=2×104W,图中的v2为汽车的最大速度,则汽车在图示的ABC运动过程中,当速度v=10m/s时,发动机的瞬时输出功率P=____W.
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答案(点此获取答案解析)

加速度减小的加速运动,2×104

同类题2

Dear Disney,
   Last weekend, the four members of my family spent an enjoyable holiday at the Magic Kingdom - Disneyland. And one event made our visit seem truly magical. We got to the front of the line at Space Mountain, only to find out that our little daughter Gloria couldn't take her ice-cream on the ride. We were so excited that we all forgot ice-cream was not allowed on the ride.

   Gloria broke into tears and we all had no idea what to do. Then Murphy, one of the staff(员工) members, came over. She bent down and told Gloria that she would hold the ice-cream for her and give it to her when she finished the ride. Gloria said, "Promise?" Then she gave Murphy her ice-cream, and she completely enjoyed the ride.
   Sure enough, as we walked out the exit, there was Gloria's new friend with "her" ice-cream. Now you and I both know what happened, because we know that an ice-cream won't last twenty minutes on a summer afternoon in Florida. Murphy knew' what time we would get off the ride; she went to the nearest shop and bought a brand-new ice-cream thirty seconds before we walked out the exit. Gloria said, "Thank you," but I'm sure she thought it was the same ice-cream.
   We know that someone tried hard to make our visit special. Thanks so much for going above and beyond!                                                                                                                                                                                                 Your fan,                                                                                                                          Carmen Rivera