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# GEN PHYS FOR TECH ST PHYS 2101

LSU

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This 20 page Class Notes was uploaded by Elva Fahey on Tuesday October 13, 2015. The Class Notes belongs to PHYS 2101 at Louisiana State University taught by Staff in Fall. Since its upload, it has received 13 views. For similar materials see /class/223002/phys-2101-louisiana-state-university in Physics 2 at Louisiana State University.

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Date Created: 10/13/15

PHYS 2101 General Physics for Technical Students Spring 2009 Objectives for Unit 4 By the end of this unit students should be able to 41 F N 44 F m 46 g 7 F 00 F to bu H H 4 12 413 Using the expression for gravitational potential energy and conservation of energy relate speed and distance for objects in free ight including the concept of escape velocityi Apply Newtons second law and Newtons law of gravity to circular orbit problems to draw conclusions about the energy of objects in orbit and Kepler7s Law of Periodsi Relate pressure and pressure differences to the forces acting on a surface Know the de nitions of density and pressure and be able to apply these de nitions to determine differences in pressure at different points in a ui i Solve problems involving buoyant forces on submerged or oating objectsi Recognize the form of the equation for the displacement of a simple harmonic oscillator as a function 0 time Given such an equation be able to determine the frequency f period T angular frequency w amplitude A phase constant 45 and maximum speed and acceleration for the oscillator Use conservation of energy to relate position and speed of an undamped oscillator at one moment to position and speed at a different momenti Using Newtons second law rewrite the general form for the equation of motion of a simple harmonic oscillator as a 7wn3tzi From this determine the angular frequency of oscillation about free unforced oscillations of the same systemi Given a speci c expression for a traveling transverse or longitudinal harmonic wave determine ampli tude angular frequency frequency wavenumber wavelength period and wavespeedi For a particle within a medium calculate the transverse displacement transverse speed and transverse acceleration at a particular point in space as a given transverse wave passes by For standing wave modes on strings sketch the wave pattern identify nodes and antinodes and determine wavelength harmonic number resonant frequency and wave speed For interference problems determine phase difference from path length differences and determine the amplitude of the resultant wave forr a given phase difference Correctly use the Kelvin temperature scale and translate other temperature scales to the Kelvin scalei Given a temperature change calculate the linear or volumetric expansion of a substance and relate the linear expansion coef cient a to the volumetric expansion coef cient r Lecture 26 Fluids Phys 2101 Gabriela Gonz lez Pascal s principle A change in the pressure applied to an enclosed incompressible uid is transmitted undiminished to every portion of the uid and to the walls of its container Hydraulic lever FA F0IA0 F0Fi AgAl A force ampli er Pascal principle Car brakes httpauto howstuffworkscombrake5 htm Simple Brake System When a body is submerged in a fluid a buoyant force Fb from the surrounding fluid acts on the body directed upward and with a magnitude equal to the weight of the fluid that has been displaced by the body Apparent weight in a fluid What does a balance read when it is measuring the weight of a submerged body N r I I I Funds In motlon Mass ow rate pAv constant 1Timc HAI Bernoulli s equation PHYS 2101 By 3 CAD CA3 CA3 CA3 CA3 CA3 9 oo 3 3 10 311 General Physics for Technical Students Fall 2008 The Big Idea for Unit 3 o The rst goal of this unit is to understand how to use Newton7s Second Law for rotational motion to solve physical problems and describe the rotational motion of objects The second goal of this unit is to understand the gravitational interactions between particles due to both the gravitational force and gravitational potential energy Objectives for Unit 3 the end of this unit students should be able to l Relate angular position 9 angular velocity w angular acceleration a and time t Relate linear speed to angular speed and distance Use the noslip condition to relate linear motion to angular motioni Relate rotational kinetic energy to moment of inertia and angular velocity Solve conservation of energy problems involving rotational kinetic energy and use the rotational workkinetic energy theoremi Calculate torque from the force and the position that the force is applied Calculate angular momentum for particles from linear momentum and position and angular momentum for extended objects from moment of inertia and angular velocity Use Newtons 2nd Law for rotational motion to relate net torque to the product of the moment of inertia and angular acceleration or to the rate of change of angular momentumi Also combine this with Fm m6 for systems with both angular and linear motion Correctly use the right hand rules to determine the direction of vector cross products and the direction of angular quantitiesi Apply the conservation of angular momentum to situations where the net external torque equals zero or has a component equal to zero De ne mechanical equilibrium for an object and use the de nition to solve for unknown forces or torques acting on an o jecti Use Keplers laws to relate distance velocity and period of revolution for planetary systems or satellitesi 9 Calculate the gravitational force acting between pointlike or spherical objects using Newtons law of gravitation Apply Newtons second law and Newtons law of gravity to circular orbit problemsi Using the expression for gravitational potential energy and conservation of energy relate speed and distance for objects in free ight including the concept of escape velocityi Lecture 25 Fluids Phys 2101 Gabriela Gonz lez Dens y Density mass per unit volume p AmAV If uniform p m SI units kgm3 Materials Object IntersteHar space Best aborator l vacuum Av zmc arm 1 atm pressure znvc and 5m atm surcrcam xce Water mm and am 23 C and 5a aim Seawater zuvc and 1 atm wncxe mood new cu Densllv knm3 m 2a 10quot 121 ms 1x102 0917x1113 0996x103 1000x1113 1024x1113 1060x1113 some measures Materials Object xrcn Mercury the mela not me manet Earm average Sun average Wmte dwaran core Uramum nudeus Neutmn star Accra Denslh kgm3 136x103 55x103 95x103 28x103 14x103 16x10 Pressure Pressure force per unit area p SI u s m2 a NonSI units 1 am 101gtlt105 Pa 760 ton 760 mm Hg 1 am 147 Ibin2 psi YAELE u same Pressures Pressure Pa Fressure Pa Centerofthe Sun 2 x 10 Aummonuei Center orEam 4 X101 Atmosphere at sea 1eve1 1 EX 105 15x10 16x104 ueepes ocean men bottom 1 1 X W2 nest 1aboratory vacuum Wu Smke hams an a dance ner Pressure Pressure force per unit area p SI u s m2 a NonSI units 1 am 101gtlt105 Pa 760 ton 760 mm Hg 1 am 147 Ibin2 psi Current Wemher Conditions Baton Rouge Baton Rouge Metropolitan Ryan Fieid LA United States KETR 3073271414 091 rousw 21M Enn klmal onzizuu7 55mm 3 20n71n212253um WmdlmmiheE0nudegreesaiEMFN7Kn vxsmmry 1n mien Reiatlve Humidity 5st Preisure skimmer 25 9217i Hg mm m Fluids at rest Pressure in uids at rest increase with depth due to weight of uid on top p pa pgh F pA F0 pghA F0mNgV F0 mg A In Lari 5 Liquid Pressure decreases when climbing mountains and increases when diving In both cases be careful with pressure changes Example How deep in the sea is the pressure twice as much the pressure at the surface Would the answer be different in a mountain lake Barometers Vacuum 7 Grass tuba li http39llautnquot quot 39 39 essuregaugehtm Herghl 76 cm 2992 rn MWVWWWWW r 6 Ham How long should a mercury barometer mun xed be to measure 29 psi tire pressure Pascal s principle A change in the pressure applied to an enclosed incompressible uid is transmitted undiminished to every portion of the uid and to the walls of its container Hydraulic lever FA F0IA0 F0Fi AgAl A force ampli er Pascal principle Car brakes httpauto howstuf Aorkscombrake htm Simple Brake System When a body is submerged in a fluid a buoyant force Fb from the surrounding fluid acts on the body directed upward and with a magnitude equal to the weight of the fluid that has been displaced by the body Apparent weight in a fluid What does a balance read when it is measuring the weight of a submerged body

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