PHYS Exam 3

PHYS Exam 3

1. Chapter 10

   • Fluids and Gravity
     • Pressure - Pascal or Pa = N/m62
       • P=F/A
       • Patm=1.01 x 10^5 Pa
       • Gauge Pressure- Pressure against the gauge is due to forces on both sides as well as the spring.
       • Pressure changes from place to place within fluids.
         • Pressure increases as as one goes deeper into a fluid.
         • Pascals Principle - If the pressure at one location in a closed container of fluid changes, this change is transmitted equally throughout the fluid.
           • Hydraulics
     • Density
       • p=M/V
       • Compression
         • Liquids with densities not effected by pressure are incompressable.
         • Gases depend on pressure - compressable
       • Specific Gravity
         • Density of substance vs. that of water's
     • Buoyancy
       • Fluid exerts an upward force equal to the weight of the fluid displaced by an object.

2. Chapter 8 Rotational Movement

   • Angular position
     • When the angular position increases at a constant rate the ang. acc. is zero but it has centripetal acc.
   • Angular Velocity
     • A measure of how quickly the angle changes.
   • Angular Acceleration
     • The average angular acceleration during a time interval is related to changes in angular velocity
     • Rotational Equalibrium
       • Both rotational and translational acc. equal zero
     • Moment of Inertia for when the ang. acc. equals zero
   • Connection between Linear and Rotational Motion
     • v=2pir/T=2pir/(2pi/w)=wr
     • In one revolution a particle travels a distance of 2pir
   • Torque
     • Force multiplied by distance from pivot point
       • Perpendicular forces contribute to ang. acc.
     • Counterclockwise is positive. Clockwise is negatvive

3. Chapter 11 harmonic motion elasticity

   • oscillatory motion ( sin and cos curve)
     • frequency
       • period time = T
         • f=1/T
       • f=(1/2pi)(srt(k/m))
   • Simple Harmonic Motions
     • y=Asin(2(pi)ft
       • amplitude =A
         • height of curve
     • f=w/2(pi)
       • w= angular frequency
     • position as a function of time
       • x=Acos(2(pi)/ft)
     • Velocity as a function of time
       • v=-2(pi)fAsin(2(pi)ft)
     • pendulm
       • bottom of the arc is the equilibrium
         • f=(12pi)(srt(g/L))
       • period and frequency are independent of mass and amplitude
       • 1/mv^2max=PEmax=1/2(kA^2)
   • spring mass oscillator
     • Hooke'sLaw
       • fsping=-kx
         • Fspirng is always directed toward x=0
       • stress and strain
         • young's modulus
         • value of strain is the elastic limit
         • sheer stress F/A where F is the cross section
     • restoring force opposes n=movement away from equilibrium