If a piece of iron is placed in pure nitrogen, nothing happens. if the in is exposed to air, it begins to rust. what conclusion can you make about air, based on this observation?

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

Identify some abiotic characteristics of the tundra biome.