By Samuel Seely

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1-8. 2. One of the coils is mounted on pivots so that it can move inside of the other coil. Sketch the variation of M with angle of rotation, as the angle varies from0to360deg. 1-9. The approximate characteristic of a diode is shown in the accompanying sketch. Write expressions for the terminal characteristics of this device. 1-10. A piecewise linear approximation to a tunnel diode i — v characteristic is shown. 3 5 volts. 1-11. a. A triangular voltage wave is applied to a diode which has the static characteristic shown.

Repeat a. for the case when the / — v characteristic is approximated by the two section piecewise approximation shown. 60 Modeling of System Elements v (volts) Problem MO 200 f(sec) 100 0 Problem M l 5 10 v(volts) Problems 61 1-12. A nonlinear spring is described by t h e / , x relation, f=2x-ix2. 8 is applied, determine approximately by graphical means, the di splacement x (/). 1-13. The damping factor of a linear bilateral damper is D = 20 Newton-sec/m. A sinusoidal velocity with a peak amplitude of 20 m/sec and with a period of 1 sec is applied.

In radiant heat transfer thermal energy flows from a region of high tempera ture to one of lower temperature by an electromagnetic radiation process. 672 x 10"8 Joules/irf-sec-deg4, e = emissivity of the surface (ranges between 0 and 1). This is a fourth power flow law between the through variable and the across variable, as against the square-root relation for turbulent flow, and the linear relation for electric current. The thermal resistance for radiation is written, R = M = 4di8} (deg-sec/Joule) (1-76) where 6a = average of radiator and receiver temperatures.