A stream moving with a speed of 0.5 m/s reaches a point where the cross-sectional area of the stream decreases to
one-fourth of the original area. What is the water speed in
this narrowed portion of the stream?

Why do electron microscopes have higher resolving power than light microscopes?

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

During cooling, the kinetic energy of the molecules falls. why does this happen? a.the motion of the molecules increases. b. the motion of the molecules slows down. c.the van der waals forces between molecules decrease d. the forces of attraction between the molecules are overcome.