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At any given point P of a continuous medium, the surface forces are given by the stress tensor, which is a real symmetric matrix Σ. It is a well-known theorem of linear algebra (see the appendix) that any such matrix can be brought into diagonal form by a suitable rotation of the Cartesian coordinate axes. Use this to prove that at any point P there are three orthogonal directions (the principal stress axes at P) with the property that the surface force on any surface normal to one of these directions is exactly normal to the surface.
An electric ventricular assist device (EVAD) that helps pump blood concurrently to a defective natural heart in sick patients can be shown to have a transfer function G(s) = Pao(s)/Em(s) =1361/ s2 + 69s + 70.85 The input, Em(s) is the motor's armatur..
A 32 channel TDM system samples messages at 8000 samples per second, uses 2 bits for frame synchronization and 8 bits per sample. What must be the highest frequency in the message spectrum to guarantee perfect recovery of the original signal
Two semiconductor materials have exactly the same properties except that material A gives photoluminescence at 1240nm and material B at 1033nm. Determine the ratio of ni for material A to that of material B for T=300K.
discharge a capacitor of 1mF charged with a voltage of 1 volt we connect it, at time t = 0, with a esistor of R ohm. When we measure the voltage we find it to be V(r) (t) = e ^(-t) u(t). Determine the resistance of R. If the capacitor has a capaci..
High-definition television (HDTV) generates images with a resolution of 1125 horizontal TV lines interlaced (where every other line is painted on the tube face in each of two fields, each field being 160th of a second in duration).
The power measured by a Prony brake attached to an engine flywheel is 3.8 brake horsepower. The indicated horsepower, as measured by means of indicator cards is 4.1. What is the efficiency of the engine
Given a coaxial cable with solid inner conductor of radius a, an outer conductor that goes from radius b to c (so c>b>a), a charge +Q that is assumed evenly distributed throughout a meter length of the inner conductor
Design a filter for a biomedical instrument to eliminate DC (f = 0), 500 Hz tone, and its corresponding harmonics. The system sampling rate is 2,000 Hz. Place all the required poles at the origin to obtain a FIR filter.
There are three gates. Each gate can be opened or closed depending on the three logic inputs: (a, b, c). Gate open logic=1, gate close= logic 0. Design a logic circuit so that no adjacent gates or outputs (x, y, z) are open at the same time.
a single-turn square loop of wire 2.00 cm on each edge carries a clockwise current of 0.200 a. the loop is inside a
Calculate the concentration of electrons and holes in a sample of silicon that has a concentration of acceptor atoms equal to 10^16/cm^3. Is this semiconductor n or p type
The maximum strength of the magnetic field in an electromagnetic wave is 3.44E-6 T. What is the maximum strength of the wave's electric field
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