I. Choose the Correct Answer 1. An object moves in the xy plane with an acceleration that has a positive x component. At time=0 the object has a velocity given by=3i +0j. What can be concluded about the y component of the acceleration?

I. Choose the Correct Answer 1. An object is moving along the x axis with position as a function of time given by x=x(). Point is at x 0. The object is definitely moving toward O when

§1.1 参考系、质点 §1.2 位置矢量、位移(矢量)、运动方程 §1.3 速度、加速度、匀加速运动 §1.4 曲线运动 §1.5 相对运动(relative motion)

Chapter 4 Differential Relations For Viscous Flow 4.1 Preliminary Remarks Two ways in analyzing fluid motion (1)Seeking an estimate of gross effects over a finite region or control volume. Integral ()Seeking the point-by-point details of a flow pattern by analyzing an infinitesimal region of the flow

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

Case patient xxx, female, 35 years old Symptom: amenorrhea for47days; spot vaginal bleeding for days; sudden abdominal pain for 2 hours. Signs: Bp 12/8Kpa, P 120 times/min, abdominal tenderness and rebound tenderness(+); sharp pain on motion of the cervix

The causes of acceleration of a system--The first law of motion states that zero total force exists when the system has a constant velocity; a nonzero total force on the system causes its acceleration

Chap. 14: Energy in Thermal Processes Solids, liquids or gases have internal energy t Kinetic energy from random motion of molecules translation rotation vibration

Today' s topics Fluids in motion Bernouilli’ s equation Viscous fluids Simple oscillations

Here we'll discuss the basic idea behind an engine, and then go into detail about how all the pieces fit together and how to increase performance Internal Combustion Almost all cars currently use what is called a four-stroke combustion cycle to convert gasoline into motion. The four-stroke approach is also known as the otto cycle