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Choose articles related to current epidemiologic trends for infectious diseases and/or the impact of diseases and of the control measures on global populations.
Design a viscous damper so that at the rotating speed w = 4con the force transmitted to the support does not exceed 250 N.
The cam and follower of Fig. a impart a displacement y(t) in the form of a periodic sawtooth function to the lower end of the system.
Solve the differential equation mx¨(t) + cx·(t) + kx(t) = kf(t) by means of a Fourier analysis, where f(t) is the periodic function shown in Fig.
Determine the initial velocity z(0) = v0 for the case in which the initial displacement has the value x (0) = x0 = 2cm.
Determine the natural frequency of the system of Problem below. A cantilever beam in bending is made of two uniform sections, as shown in Fig.
The circular shaft of Fig. has the torsional stiffness GJ(x) = GJ[1-½(x/L)2]. Obtain the equivalent spring constant corresponding to a torque at x = L.
A disk of mass in and radius R rolls without slip while restrained by a dashpot with coefficient of viscous damping c in parallel with a spring of stiffness.
Calculate the frequency of damped oscillation of the system shown in Fig. for the values m =1, 750 kg, c = 3, 500 N . s/m, k = 7 x 105 N/m.
Consider the system of Fig. and plot the response to the initial conditions x-(0) = 2cm, 1(0) = 0 for the values of the damping factor ? = 0.1,1 and 2.
A projectile of mass m = 10 kg traveling with the velocity v = 50 m/s strikes and becomes embedded in a massless board supported by a spring of stiffness.
Derive the equation for small motions y(0 from equilibrium, as well as the natural frequency of oscillation.
Derive the equation for the horizontal translation of the slab and determine the natural frequency.
To determine the centroidal mass moment of inertia lc of a tire mounted on a hub, the wheel was suspended on a knife edge.
A connecting rod of mass m = 3 x 10-3 kg and centroidal mass moment of inertia ic = 0.432 x 10-4 kg m2
A simple pendulum is immersed in viscous fluid so that there is a resisting force of magnitude ca acting on the bob.
Calculate the damping factor ( and determine the maximum displacement amplitude during cycle 4½ as a fraction of the first.
What would happen to the velocity and acceleration of the marble if the ramp were steeper? How about if the ramp were vertical?
An optical link is established between two satellites separated by 400km.
Brainstorm/scattershoot and list at least 10 concepts/detailed facts/historical evidence about key changes in government from 1770 to 1850.
What molecules absorb infrared light, but water vapor is not believed to contribute to global warming. Why not?
Five laser sources transmit plane waves to an optical receiver, as shown below. Each laser produces intensity of 10-6 W/m2 at the receiver.
What determines the toxicity of a chemical? To what extent do you agree with the assumption that "all substances are poisons"?
What is the gear ratio of this gear train? If the rotational speed (angular velocity) of gear B is 4 rad/s, what is the rotational speed of gear A?
The benefit of using a Schmidt corrector plate in a reflecting telescope is that.