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1.一个质量为m_1的球,碰撞一个静止的质量为m_2的球,碰撞以后运动如图所示,如果m_1=m_2,m_1与m_2碰撞以后的速度之比为3∶4,求m_1碰撞前后速度比。 2.一个质量为M的子弹以速度ucms~(-1)飞来,击穿厚度为tcm的木板,子弹离开木板时速度为vcms~(-1),求阻力是多少克重? 3.如下列图中表示的一些力组成的系统,哪个处在平衡中: 4.一个物体被两根绳子悬挂起来,两绳的位置不同绳中张力也不同,哪种挂法绳中张力最大?
1. A ball of mass m_1 collides with a ball of static mass m_2. After the collision, the motion is as shown in the figure. If m_1=m_2, the ratio of the velocity after the collision between m_1 and m_2 is 3:4, and before and after m_1 collision speed. 2. A bullet with a mass of M flies at a speed of ucms~(-1) and punctures a board with a thickness of tcm. When the bullet leaves the board, the speed is vcms~(-1). How much is the resistance required? 3. The following diagram shows some of the forces of the system, which are in the balance: 4. An object is suspended by two ropes, two ropes in different positions in the rope tension is also different, which is the greatest tension in the hanging rope?