What energy conversion occurs when a battery powered car rolls across the floor?
a. stored chemical energy is converted to mechanical energy.
b. stored electrical energy is converted to mechanical energy.
c. stored mechanical energy is converted to mechanical energy.
d. stored nuclear energy is converted to electrical energy.

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt

Draw the aromatic compound toluene (methylbenzene). show all hydrogen atoms, including those on the ring.