A girl on the swing may increase the amplitude of the swings oscillations if she moves her legs at the natural frequency of the swing this is an example of

Aweight lifter raises a 1600 n barbell to a height of 2.0 meters. how much work was done? w = fd question 6 options: 3000 joules 30 joules 320 joules 3200 joules

Which statement best describes copper? a. it has a low resistance and prevents charges from moving freely. b it has a high resistance and allows charges to move freely. c. it has a high resistance and prevents charges from moving freely. d. it has a low resistance and allows charges to move freely

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine