At the heart of a grandfather clock is a simple pendulum 1.55 m long; the clock ticks each time the pendulum reaches its maximum displacement in either direction.

Which safety measures should you follow during a thunderstorm? check all that apply. (a) avoid touching anything that conducts electricity. (b) avoid touching a person who has been struck by lightning. (c) go outside. (d) keep your computer turned off. (e) stay out of water. (f) stay inside.