力是束缚矢量是因为力需要考虑作用点，而自由向量是不需要考虑起点的！
解析 = 36 The displacement vector is D= (PQ)=2,5,2, so by Equation 12, the work done is(split) W&= F⋅ D=3,4,5⋅ 2,5,2\&=6+20+10=36(split)If the unit of length is meters and the magnitude of the force is measured in newtons, then the work done is 36 J....
1 Which is a vector quantity?(1) electric charge(2) electric field strength(3) electric potential difference(4) electric resistance5 A machine launches a tennis ball at an angle of25° above the horizontal at a speed of 14 metersper second.The ball returns to level ground.Which combination...
Because force has both magnitude and direction, it is a vector quantity. The representation of forces by vectors implies that they are concentrated either at a single point or along a single line. This is, however, physically impossible. On a loaded component of a structure, for example, the...
Force is everywhere and it comes in a variety of sizes, directions, and type. We can define Force as the push or pull of an object. Learn Force definition, unit & types of Force with solved examples.
(9.6). If the problem is of two dimensions, namely, all the forces lie in the Oxy plane, only the first two columns of F and R need to be specified. resultant (F) only computes the resultant force. [F_sum, M_sum] = resultant (F, R) returns the resultant force in a vector F...
Principal vector can not be defined as a force主矢不能定义为力研究所研究题目集中力量可能性共同工作科学苏维埃退行物理解决苏维埃科学在苏联的共产主义建设中起着重要的作用。我国向共产主义前进的速度在相当大的程度上取决於科学的成就,因为科学不仅能够帮助我们解决当前国民经济中的问题,而且能够以其理论研究为我们...
The external force beneath each foot is a vector quantity. The magnitude of three orthogonal components of force must be controlled—we refer to this as force-magnitude control. As is conventional, we represent these force components as forward and backward in the horizontal plane (or anterior ...
A force of 36pounds acting in the direction given by the vector is required to pull a weight across a floor. What is the work done if the weight is pulled 10feet from to ? [Round the answer to thenearest tenth.] 相关知识点: 试题来源: 解析 185.2ft‑lbs 185.2ft‑lbs 反馈...
The force-vector theory contends that horizontal exercises are more specific to horizontal sports skills. In this context, the focus is on horizontal force production relative to the global coordinate frame. However, according to the principle of dynamic correspondence, the direction of force relative...