Energy Smart

Cedric asked:


An object with a weight of 50.0 N is attached to the free end of a light string wrapped around a reel of radius 0.250 m and mass 3.00 kg. The reel is a solid disk, free to rotate in a vertical plane about the horizontal axis passing through its center. The suspended object is released 6.00 m above the floor.

Powered by Yahoo Answers

tn asked:


Two people with a combined mass of 144 kg hop into an old car with worn out shock absorbers. This causes the springs to compress by 9.20 cm. When the car hits a bump in the road it oscillates up and down with a period of 1.57 s.
(a) Find the total load supported by the springs.
kg
(b) Find the mass of the car.
kg

please show me how to do it. THANKS!

Powered by Yahoo Answers

15fsg546rge1rrheljh45hjr90459ty3 asked:


Rather than pour all our money into energy exploration, new energy sources, technology, etc.; is it cheaper to make us all able to see in the dark? We have night vision technology, and medical and genetic technology has increased substantially over the past few years. Has anyone done any experimentation with lab rats to see if they can be altered to be able to see in the dark? Would this be cost effective if, rather than light the planet, we could get everyone to see in the dark. Yes, this sounds ridiculous, but the goals required to achieve energy conservation, and reduce greenhouse gases are pretty much in the air still. Is this probable?

Powered by Yahoo Answers

maria farina elaine c asked:


then is there an end point to where will all the energy be transformed..? is the sun only the source of energy why we are living here?

Powered by Yahoo Answers

tha_most_unknowns asked:


Much discussion has focused on the need to drive more efficient cars and use less electricity. If the law of Conservation is true, why are people concerned about energy uasge?

Powered by Yahoo Answers

boom shaka lacka asked:


List as many as you can!

Powered by Yahoo Answers

A_2__the__E__Adrenaline asked:


The law states that energy cannot be created or destroyed, but aren’t you creating energy if you get back more energy than you put into it? Just a thought

Powered by Yahoo Answers