What evidence do you have about when some metal objects rust?

Rust takes place when metals get corrode. For example: iron surface get corroded in the presence of water and oxygen and form iron oxide (rust).

The evidences are:

Metals gets oxidized, oxidation state increases which results in corrosion.  

The strength of the object decreases and change in appearance will occur.

8 m/s because for him to get the same amount of energy as ray is putting out, bobby, who weighs half as much as ray, needs to run twice as fast.

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them