Energy Smart

|2yan Owns™ asked:


PLEASE I REALLY NEED HELP!!
=]]

♥ Emily Price™

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pooja h asked:


it has to be a working model on conservation of energy that can be made in a comfortable budget. it can be a group project.

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Miklós G asked:


Imagine a twenty inches box which can be switched on the electric power supply. You can leave it working for any time, it will consume notable more electricity (energy) than the loss of friction, heat and the radiation of electromagnetics (and other like vibration etc.) It does not store the energy, you can’t retrieve. It exists, based on the traditional kinetic, so I really want to know weather it infringe the law of E.C. or comply - and I miss. It seems that this box transforms the energy into an unknown form (for example into gravity waves) otherwise it could eliminate the whole energy of the universe -theoretically during a very long time period.

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academic1602 asked:


If I swing some object attached to a rope around myself in the horizontal plane and I wish to bring it closer, I have to pull the rope. The law of conservation of angular momentum states that the velocety of an object will increase, also, the kinetic energy of the object will increase, so, some work must be done on the object. But how can work be done on an object when the tension of the rope (the centripetal force) is always perpendicular to the object’s velocity and therefore cannot perform work. What force accelerates the object?

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ramonefan101 asked:


Thanks so much. This is for my science class.

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Honest Opinion asked:


Since the Americans began conserving fuel, the price per barrel has dropped significantly. Isn’t this proof that conservation is the solution to energy cost (supply/demand) rather than more drilling.

http://news.yahoo.com/s/ap/20080717/ap_on_bi_ge/oil_prices

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blcklabelx asked:


At a carnival, you can try to ring a bell by striking a target with a 9.00-kg hammer. In response, a 0.400-kg metal piece is sent upward toward the bell, which is 5.00 m above. Suppose that 25.0% of the hammer’s kinetic energy is used to do the work of sending the metal piece upward. How fast must the hammer be moving when it strikes the target so that the bell just barely rings?

Please show your work with all formulas used. (conservation of energy formula I believe)
Show your answer in terms of the variables given and a numerical answer.

Thanks.

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