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X、Y、Z三种元素的原子序数都小于l8，它们的原子序数依次增大，最外层电子数依次为4、1、7。其中X元素的原子次外层电子数为2；Y元素的原子次外层电子数为8；Z元素与Y元素位于同一周期。X元素的原子结构示意图为__________；Y元素位于周期表中第__________族，元素Y和Z相互作用形成化合物的电子式为__________。
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要除去硫酸亚铁溶液中含有的少量Fe3+和Cu2+，最好加入的试剂是__________。
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如图所示，一根圆导线，通电流I1，另一根直导线通过圆心，垂直于圆导线所在平面，通电流为I2．圆导线所受的磁场力为F1，直导线所受的磁场力为F2，则（??）
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将一个电荷量为10-9C的点电荷放在电场中的P点，点电荷所受电场力的大小为5×10-6N．如果把点电荷撤去，那么P处的电场强度大小为（??）
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3.Friction is a force which opposes motion. Much of the energy supplied to a complicated machine with many moving parts is wasted in overcoming this opposition. The energy is converted into useless heat. The amount thus lost can be considerably reduced and the life of the machine prolonged by careful lubrication. This reduction improves the efficiency of the machine. Another way in which friction is reduced is to substitute roller or ball bearings for the earlier type of bearing, in which the surfaces in contact move by sliding. Bearings of these later types are used very extensively in many kinds of modern machinery.It must not be assumed, however, that friction is always a disadvantage. In many instances it is highly important. Belts are often used in conveying power from one machine to another. In the absence of friction, this could not be done. The driving wheel would not run the belt, neither would the belt run the wheel to driver. Without friction, then, belted machinery could not be used. Again in the case of all motor vehicles, friction is essential in the operation of the brake. Were there no friction, there could be no brake. But even this illustration does not give an adequate picture of the importance of friction. The vehicle could not even be started if it were not for the friction exerted between the tires and the road. Nails hold in wood, and screws hold in either wood or metal by reason of friction, without which they would be useless. Walking is difficult enough on an icy pavement, but it would be wholly impossible if there were no friction at all between the shoe and the pavement.(5分)3.1Friction arises when____.(1分)A. an opposing force of motion existsB. the energy is wastedC. everything is motionlessD. a complicated machine is supplied with energy
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