Rachael is wearing roller skates and is

Name two kinds of practical electric pumps.

What type of force holds atoms together in a crystal?

Which of the following is a true statement about the acceleration ~a of the pendulum bob ~a is equal to the acceleration due to gravity. ~a is perpendicular to the bob’s trajectory. ~a is equal to the instantaneous rate of change in velocity. ~a is tangent to the bob’s trajectory.