Physics

Physics, 05.07.2019 01:10, lrasanaoaksandfurana

The starting conditions of an oscillator are characterized by 1. the initial acceleration 2. the phase constant 3. the phase angle 4. the frequency

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Physics, 04.07.2019 22:20, shaniqwakirkseyniqwa

Consider the classical mechanical description of a one-dimensional harmonic oscil lator of mass 0.2 kg , with spring constant k 5 n/m, (linear) damping constant b 0.2 ns/m. this oscillator is subject to a sinusoidal driving force of strength f 0.5 n and frequency f 0.5 hz (i irrespective of the initial conditions, after a long time the oscillator will ex- ecute regular sinusoidal oscillations. what will the frequency and amplitude of the oscillator's motion be? what is the phase of these oscillations relative to the driving force? (ii) write down newton's second law for the oscillator. identify all forces acting on the oscillator (assume gravity plays no role). indicate which of these forces are conservative and explain why. for each conservative force give the associated potential energy

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Arigid thermally conductive container containing liquid refrigerant 11 has a leak. the conditions outside the tank are 298 k and 100kpa. the starting mass of r-11 is 7kg, at the end of the process only 3kg remain(as a two phase mixture). temperature remains constant throughout the process. at this point it is a two phase mixture. determine the final quality of the two phase ,mixture.

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Physics, 21.08.2019 04:30, 10027126

The lockheed sr-71 blackbird aircraft made an absolute speed record in 1976. calculate the aircraft's top speed in kilometers per hour if its flight was characterized by the mach angle a 17.8 degrees. the speed of sound at the flight altitude is 300 m/s. [10 marks] (b) light can be viewed as an electromagnetic wave or as a particle with momentum punk where = h/21 = 1.055 x 10- js and k is the photon wave number defined as k = 2/1 the speed of light in vacuum is c = 3 x 10 m -. determine whether the propagation of a photo in vacuum is dispersive by calculating both phase and group velocities for propagation of light in vacuum. [20 marks) (c) (i) formulate the equation of motion for a damped oscillator driven by a sinusoidal driving force f(t) = fosin wt. the damping force is given by-bv where v is the velocity and b is the viscous force constant. (i) find the expression for the steady state amplitude a and phase shift 8 of the oscillations as a function of the driving frequency w, and (iii) find the value of the steady state amplitude for the system characterized by the mass m = 0.5 kg, the spring constant k = 200 n/m, the viscous force constant b 10 n s/m, and the amplitude and angular frequency of the driving force fo=20 n and w = 30 rad/s respectively.

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