A car was traveling northeast at a speed of 30 m/s. It increased its speed to 45 m/s in 20 seconds. What was the car’s acceleration?

18. use the activity series to predict whether the following synthesis reaction will occur. write the chemical equations for the reaction if it's predicted to occur. (s) + o2(g) -> *note: it is possible.*

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.

The nuclear fission process releases neutrons and question 27 options: alpha particles electrons energy beta particles