1. which of the following tools can be used to mesure mass. (answer = 5 + points)

a. a graduated cylinder

b. a triple-beam balance

c. a mercury thermometer

d. a bathroom scale

If your accelerator suddenly gets stuck what should you do

For positive constants a and b, the force between two atoms in a molecule is given f(r) = −a r2 + b r3 , where r > 0 is the distance between the atoms. note: a and b are upper case letters. (a) find f '(r) = (b) find the critical point for f(r). r = (c) find f ''(r) = (d) find the value of r so that f ''(r) = 0.

Me and category do i put them in because this is science