Find the density of a 5 kg solid cylinder. the cylinder is 5 cm tall and has a radius of 2 cm.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Which changes of state do the labels represent? a: b: c:

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.