What device can I make or buy that can climb a string at a slope?
Q. My Physics project is simply stated : Your objective is to make a device that can climb a string at a slope. What is required is using a 9volt battery, motor, and an on/off switch. The restrictions contain no explosions, no chemicals, no rockets, and no fires.
Asked by MiniMouse - Sun May 31 20:43:24 2009 - - 1 Answers - 0 Comments

A. hi jeremy :) i googled the project and this was the first result... >_>
Answered by wh:Oa - Tue Jun 2 20:18:21 2009

How do I design a simple device that demonstrates the energy, momentum, and angular momentum principles?
Q. My physics teacher has asked me to design a physical device within a week that will demonstrate to him my general understanding of the conservation of energy principle, the momentum principle, and the angular momentum principle. Any ideas on how to construct this device or a Goldberg device that will be easy to put together?
Asked by Albert C - Thu Jul 2 00:46:58 2009 - - 1 Answers - 0 Comments

A. Flywheel driven electric car. (A model car using a flywheel + motor/generator instead of a battery) You "charge up" the car by using an external source of electricity to drive the motor to speed up the flywheel. Then when running, the flywheel turns the motor which generates electricity to drive the motors connected to the heels. Or, simpler, but messier, a boat driven by a propellor. The movement of the water backward drives the boat forward - linear momentum; the turning of the propellor also causes tilt of the boat (which is why many ships have two counter-rotating propellors); and there is the efficiency of different sizes of propellors - energy vs. momentum. (You can do the same with a helicopter, but helicopters are much harder to… [cont.]
Answered by simplicitus - Sat Jul 4 16:46:12 2009

What is the probability that the device will detect at least one of the two shoppers?
Q. ShopperTrak is a hidden electric eye designed to count the number of shoppers entering a store. When two shoppers enter a store together, one walking in front of the other, the following probabilities apply. There is a 0.98 probability that the first shopper will be detected, a 0.94 probability that the second shopper will be detected, and a 0.93 probability that both of them will be detected by the device. What is the probability that the device will detect at least one of the two shoppers entering together?
Asked by Ducky - Tue Oct 27 19:09:51 2009 - - 3 Answers - 0 Comments

A. Ok, you must consider that the probability of at least one person being detected is the probability of P1 being detected, P2 being detected and both P1 and P3 being detected. So it is 1 - (0.02 x 0.06 x 0.07) = 0.99916 You must always show your answer like this: Therefore, the probability that the device will detect at least one of the two shoppers entering togethe is 0.99916. I hope I helped. Good luck.
Answered by Macrohard (TM) - Fri Oct 30 09:43:56 2009

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