Athird class lever has a mechanical advantage of < 1. what is an example of a third class lever and why use it? a) pulley; changes direction b) baseball bat; increases velocity c) car jack; increases the weight it can lift d) wheel barrow; makes it easier to move a load

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

How is zig zagging a form of acceleration?

How do you know how many valence electrons an atom has?