新课标高中物理3-4课后答案（New curriculum high school physics 3-4 after-school answer）.doc

新课标高中物理3-4课后答案（New curriculum high school physics 3-4 after-school answer） The eleventh chapter mechanical vibration First harmonic motion 1.: coordinate represents the time axis of the white paper, the ordinate represents the displacement. Because the time is uniform, uniform motion, the displacement of x = VT, certain displacement and time corresponding, it should drag the white uniform. If the speed of dragging white paper is m/s, the time of the 1s should be expressed at the length of 5 cm per axis, and the coordinate scale should be marked 2. (1) 10 cm. (2) at the balance position, both sides away from the balance position cm (3) at 1.5 s, move in a balanced position; at 2.5 s, move away from the equilibrium position (1) within 0-1s and within 2 to 3S, the displacement is the same as the velocity direction; the displacements within.1 ~ 2S and between 3 and 4S are opposite to the velocity (2) the displacement of the particle at the end of 2S is zero (3) the distance traveled by particles in the former 2S is 20cm Second harmonic motion description 1.: the amplitude ratio of the frequency. When, so the phase difference I know from figure 2, At that time So. Phase difference Figure 11-2-13.: 3. I know from figure 4. The restoring force and energy of third harmonic motion 1. proof: when the length of the spring is L1, it is the balance position O, and the selected slope along the inclined plane is upward, At this point When the ball vibration passes through the O point, the distance is 0, and the distance is x The movement of the small ball is a simple harmonic motion, which is derived from type two 2. points: (1) look at the buoyancy and gravity force and lift distance is proportional to, and in the opposite direction. (2) the force of the force along the tangent direction is the restoring force. With the increase of X, the restoring force increases, and the direction is opposite to the X direction 3.4cm: A, B indicates the corresponding vibration displacement size