Posted by RayP(MI) on September 29, 2012 at 10:28:22 from (207.241.137.116):
Visited a high school classroom the other day, and found a paper with the following problen laying on one of the desks --- Got me stymied. Can you figure it out? Must be something I'm overlooking. (Only been into electronics for about 50 years - son with a brand new degree in computer engineering came up scratching too).
"Imagine two rooms, one with three switches and the other with three light bulbs. Each switch controls one of the light bulbs. However, because the light bulbs are in a different room, you can't see immediately which switch controls which light bulb.
Your task is to figure out which switch controls which light bulb. You can spend as much time as you like in the room with the light switches, but eventially you must go into the room with the light bulbs. Once you enter the room with the light bulbs, you can't return to the room with the light switches. What's more,after entering the the room with the bulbs, you have only thirty seconds to figure out which switch controls which bulb.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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