The moving part of a speaker goes in and out 400 times per second. The frequency of the sound produced is: a
4 hertz.
Ob
40 hertz.
400 hertz.
4,000 hertz.

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Amass attached to a spring is displaced from its equilibrium position by 5cm and released. the system then oscillates in simple harmonic motion with a period of 1s. if that same mass–spring system is displaced from equilibrium by 10cm instead, what will its period be in this case? a mass attached to a spring is displaced from its equilibrium position by and released. the system then oscillates in simple harmonic motion with a period of . if that same mass–spring system is displaced from equilibrium by instead, what will its period be in this case? a) 0.5sb) 2sc) 1sd) 1.4s

What are the starting materials for nuclear fission? two small nuclei two large nuclei a neutron and a large nucleus a neutron and a small nucleus