How a triode functions

How a triode functions.

Flip-Flop circuits

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Average angular acceleration 9/3

A) A dentist's drill turns a 0.75 mm diameter bit at 5.0 x 10^5 rev/min. What is the linear speed of the cutting edge? B) When the drill is first turned on it takes about ¼ of a second to come up to full speed. What is the average angular acceleration of the bit? I believe the answer is A) 20 m/s and B) 2.1 x 10^5 rad/s^2. I need to see each step and formula to solve this question.

Circuits/switches

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Old Cell Phone

An old analog hand-held cellular telephone operates in the 860 to 900 MHz band and has a power output of 0.600 W from an antenna 10.0 cm long. a. Find the average magnitude of the Poynting vector 4.00 cm from the antenna, at the location of a typical person’s head. Assume that the antenna emits energy with cylindrical wave fronts. (The actual antenna pattern is much more complicated) The cylindrical waves fall off with distance S ∞1/R. b. The ANSI/IEEE C95.1-1991 maximum exposure standard is 0.57 mW/cm^2 for people living near cellular telephone base stations would be continuously exposed to the radiation. Compare the answer in part A to the standard.