题干

一弹簧枪可射出速度为10m/s的铅弹,现对准以6m/s的速度沿光滑桌面迎面滑来的软木块发射一颗铅弹,铅弹射入木块后未穿出,木块继续向前运动,但速度变为5m/s.如果想让木块停止运动,并且铅弹射入木块后都不会穿出,则再向木块迎面射入的铅弹数应为(  )

A:5颗

B:6颗

C:7颗

D:8颗

上一题 下一题 0.0难度 选择题 更新时间:2014-01-03 12:46:19

答案(点此获取答案解析)

D

同类题4

阅读理解

    When we think of leadership, we often think of strength and power. But what are these really, and how do they operate?

    Leadership today is not about forcing others to do things. If this is even possible, it is short-term. If you order someone to do something against their will, they may do it because they feel they must, but the anger they feel will do more harm in the long-term. They will also experience fear.

    Fear causes the thinking brain to shut down, making the person unable to function at his or her best. If they connect you with this emotion of fear, they will become less functional around you, and you will have succeeded in not only shooting yourself in the foot, but possibly making a very good employee or partner unable to perform effectively. Fear has no place in leadership.

    The way we affect people in a lasting way is by our own character, and our understanding and use of emotion. We can order someone to do something, which may be part of the work day, or we can employ them at the emotional level, so they become fully devoted to the projects and provide some of their own motivation (积极性). Today's work place is all about relationships.

    Anyone works harder in a positive environment in which they're recognized and valued as a human being as well as a worker. Everyone produces just a bit more for someone they like Leaders understand the way things work. They know money is not the only most motivating factor in the work life of most people.

    The true strength of leadership is an inner strength that comes from the confidence of Emotional Intelligence—knowing your own emotions, and how to deal with them and those of others. Developing your emotional intelligence is the best thing you can do if you want to develop your relationships with people around you, which is the key to the leadership skills.