# Communication Systems Questions and Answers

Physics
Communication Systems
What happened in the speaker's and listener's brains when they communicated? You may answer with bullet points.
Physics
Communication Systems
If the frequency of the wave used by your favourite station is 91.6 Megahertz, what is the wavelength? Answer in units of m. Answer in units of m If the station is 55 km away, how long does it take for the radio waves to reach you from the station? Answer in units of seconds.
Physics
Communication Systems
How much work must you do to push a 12 kg block of steel across a steel table at a steady speed of 1.1 m/s for 4.4 s? The coefficient of kinetic friction for steel on steel is 0.60.
Physics
Communication Systems
Hunter S. Thompson was a writer opposed to the Vietnam War. He wrote a piece, in the style of A Modest Proposal, suggesting that he would use napalm to kill Vietnamese dogs and perhaps some people. This text is an example of satire dramatic Irony manic sarcasm None of the choices
Physics
Communication Systems
Using the equations below calculate the efficiency of a compact fluorescent light bulb if it produces 43 J of light energy, while 95 J of electrical energy is input. Type your answer below properly rounded to the tenths place! (No units! You'll select that in a question below!)
Physics
Communication Systems
The platter of the hard drive of a computer rotates at frequency f = 7200 rpm (rpm = revolutions per minute = rev/min) a. Calculate the angular velocity o (rad/s) of the platter. b. The reading head of the drive r = 3 cm (= 0.03 m) from the rotation axis. Calculate the linear speed v of the point on the platter just below it. c. If a single bit requires 0.5 µm of length along the direction of motion, how many bits per second can the writing head write when it is r = 3 cm from the axis?
Physics
Communication Systems
Where do meteors come from? A. They are the result of supernova. B. They are melted particles that fell from comets. C. They are debris from nuclear explosions in space. D. They came from asteroids that collided and tiny pieces chip off due to the collision.
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