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一、机械能例1两发飞行的炮弹,如果具有相同的机则()。A.它们的质量一定相等B.它们的速度一定相等C.它们的高度一定相等D.它们具有的动能和势能之和一定相等解析:动能和势能统称为机械能。物体具有的机械能等于物体的动能和势能之和,在空中飞行的炮弹同时具有动能和势能,两发飞行的炮弹具有相同的机械能,他们的动能和重力势能可能相同,也可能不相同,但它们具有的动能和势能之和一定相同。答案:D。
First, the mechanical energy Example 1 two rounds of flying shells, if they have the same machine (). A. Their mass must be equal B. Their velocity must be equal C. Their height must be equal D. They must have the same kinetic energy and potential energy. Resolution: kinetic energy and potential energy are collectively referred to as mechanical energy. An object has a mechanical energy equal to the sum of the kinetic energy and the potential energy of the object. Artillery shells flying in the air have both kinetic energy and potential energy. Two flying shells have the same mechanical energy, and their kinetic energy and gravitational potential energy may or may not be the same. Has the same kinetic energy and potential energy. Answer: D.