1. The position vector and displacement Let the plane of the two-dimensional motion be the x-y plane of a Cartesian coordinate system

Winds provide the energy to set the 1940 Tacoma Narrows Bridge motion Oscillations travel to the central span and reflected from support towers. By the principle of superposition the primary and reflected waves turn into a standing torsional wave

Temperature: measure of the motion of the individual atoms and molecules in a gas liquid or solid related to average kinetic energy of constituents High temperature: constituents are moving around energetically

At ordinary temperature, matter exists in one of three states Solid- has a shape and forms a surface Liquid- has no shape but forms a surface Gas-has no shape and forms no surface What do we mean by“ fluids”? F| uids are“ substances that flow

Centripetal Acceleration UCM results in acceleration: ← Magnitude a=vr= since=

The lever arm is the perpendicular distance from the axis of rotation to a line drawn along the direction of the force

(1)a+b=0127+47-107)m=(27+4)m +b=√2+4=√200=arcn2=634 (2)a-6=127+47+10)m=(27+47)m -b=2+4050=a0cmn2=03(图略)

一、简谐振动的描述 1、简谐振动方程: 2、描述简谐振动的物理量: (1)由系统性质决定、V、T: (2)由初始条件决定A、φ: 3、用旋转矢量描述简谐振动:

Graphlte works as a lubrlcant because the planes,held together by strong chemlcal (covalent) bonds between the carbon atoms, can sllde across each other wlth only J.M.H.L.S. weak Van der Waals bonds between the planes belng broken

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