Which is true about a 5 kg weight resting on the edge of a shelf?

Select one

It has no energy because it is just sitting there.

It will have no potential energy after it falls once a force is applied to push it off the shelf

It has kinetic energy because a force it to the shelf

It has energy because a force lifted it to the shelt:

Non renewable resources like petroleum eventually

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .