A person runs 10 laps around 400m track in 20 min. calculate the runners average velocity in m/s

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?

Connect the whole numbers on the periodic table to indicate what they represent?

Identify the correct mole ratio for each substance. sodium chloride (nacl) na: cl = 1: ammonium nitrate (nhno) h: o = 4: