The motion of a piston in an automobile engine is nearly simple harmonic. if the 1-kg piston travels back and forth over a total distance of 15.6 cm if 14.2 m/s is the maximum speed of the piston, in rpm the engine is running at?

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)