Quartz, sio2, contains 46.7% silicon by mass. what mass of silicon is present in 348 g of quartz? you must show your work.

What is the measure of a change in an objects velocity?

Electromagnetic induction. a coil of wire contains n turns and has an electrical resistance r. the radius of each turn is a. initially, inside the coil there exists a uniform magnetic field of magnitude b0 parallel to the axis of the coil. the magnetic field is then reduced slowly. the current induced in the coil is i. how long does it take for the magnitude of the uniform field to drop to zero?

What organization and environment is described above?