What 2 properties make capillary action possible

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?

What is the percentage of hydrogen in nitrogen trihydride

Avariable that is not being directly tested during an experiment should be changed varied experimented controlled