Making and disposing of synthetic materials affects the amount of natural resources that are available. It also can
harm the environment. These problems may not affect us in our lifetime. Who will these problems affect?

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

What is the relationship between ozone and smog?