Smooth surfaces usually have less?

a gravity
b force
c friction
d velocity

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

Answer asap need by wednesday morning calculate the ph of 0.16m ch3cooh which has ka = 1.74 x 10-5 mol dm-3 best answer will be brainliest

How might this scientific phenomena be explained? a paper clip floats on water.