东北大学14秋学期《理论力学》在线作业1（Northeastern University 14 autumn semester theoretical mechanics online homework 1）.docVIP

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东北大学14秋学期《理论力学》在线作业1（Northeastern University 14 autumn semester theoretical mechanics online homework 1）.doc

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东北大学14秋学期《理论力学》在线作业1（Northeastern University 14 autumn semester theoretical mechanics online homework 1） 14 autumn semester theoretical mechanics online homework 1 Radio examination First, radio questions (20 questions, 100 points) One 1.6 the binding of the smooth face is directed toward the object along the normal direction of the contact surface. A. B. wrong Developing options: A Two 3.1 the two forces acting on a rigid body, FA and FB, satisfy the condition of FA=-FB, and the two force may be (). A. force and reaction or a pair of balanced forces B. on the balance of force or a couple C. on the balance of force or a force and a couple D. action and reaction or a couple Developing options: B Three 5.1, the object of W is placed on the non smooth horizontal surface. Under the action of force, it is in equilibrium. It is known that the static friction factor, the normal reaction force of the plane to the object, and the friction force F. Which of the following is true? A. must have B. may have C. must have D. May have Developing options: D Four The adaptation condition for the rate synthesis theorem of 8.3 points is (va=ve+vr) A. convected motion can only be translational B. various adapted movements are adapted C. involves motion only by rotation D. convected motion is zero Developing options: B Five At the 6.4 point along its trajectory, () If you still have an A. V A, there must be a v= constant If you still have an B. V A, then the point will be of uniform circular motion C. if v = a, is the locus of points will be straight D. if the acceleration is a=0 and the point is curve motion, then the velocity V is equal to zero Developing options: A Six 6.3 point for linear motion, the equation of motion is x=27t-t, the unit of X is m, and the unit of T is s. The distance traveled between t=0 and t=7s is as follows A. 154m B. 262m C. 54m D. 208m Developing options: B Seven The conservation of momentum of a point by a particle system of 12.2. is also conserved on any ax