How do permanent magnets and electromagnets work together to move a train? please awnser asap​

Sylvanite is a mineral that contains 28.0% gold by mass. how much sylvanite would you need to dig up to obtain 77.0 g of gold? explain how you got your answer and the steps you took. you

Drug abuse will not lead to physical and psychological dependence. true or false ?

Which are forms of frozen water? check all that apply. dew frost hail rain sleet