The year is 2029, and, as predicted, robots have taken over the world. You are given the task to come up with a communication protocol that the robots won’t be able to understand. You think back to the good old college years and think, "I sure am happy I took EE 202!" You know the robots process audio with an ADC using fs = 8000 Hz. Your idea is to use a variety of tones that will sound the same to the robots, so they won’t be able to interpret the meaning. You decide that one of your tones will have a frequency of f0 = 2000 Hz. What are 4 other frequencies that will be indistinguishable from f0 to the robots?

A23 kg log of wood begins from rest, 300 m up a sluice (a water track used to transport logs, think of it as an inclined plane with negligible friction) inclined at 20° to the horizontal. after it reaches the flat waterway at the bottom it collides elastically with a 100 kg block of wood initially at rest near the base of the incline. (a) how long does it take the 23 kg log to travel down the incline? (b) what is the speed of the 23 kg log at the bottom of the incline? (c) what are the velocities of both blocks of wood after the collision? (d) what is the total kinetic energy before the collision? (e) what is the kinetic energy of the 23 kg log after the collision? (f) what is the kinetic energy of the 100 kg block of wood after the collision? (g) what is the total kinetic energy after the collision? (h) compare the total initial and total final kinetic energies. is this consistent with what you would expect for elastic collisions? explain!

What can you increase the strength of an electromagnet by

Listed below are the measured radiation absorption rates (in w/kg) corresponding to 11 cell phones. use the given data to construct a boxplot and identify the 5-number summary. 1.16 0.85 0.69 0.75 0.95 0.93 1.18 1.17 1.42 0.54 0.57 the 5-number summary is nothing, nothing, nothing, nothing, and nothing, all in w/kg. (use ascending order. type integers or decimals. do not round.)