The price of vegetables ______ according to the weather. A: waves B: vibrates C: swings D: fluctuates

智慧职教: 84.The trial proves that the main engine performs satisfactorily. But the turbocharger vibrates too violently.

When the system vibrates in a fluid medium, the damping is ( )a)Viscous b) Columb c)Solid d)Fluid A: None B: None C: None D: None

A mass on a spring vibrates in simple harmonic motion at a frequency of 4.0 Hz and an amplitude of4.0 cm. If a timer is started when its displacement is a maximum (hence x = 4 cm when t = 0), what isthe acceleration magnitude when t = 3 s? 未知类型：{'options': ['', '', '', '', ''], 'type': 102}