Answer: radian per second.
- A radian per metre
- B cycles per second
- C metre per second
- D radian per second
Correct answer: D. radian per second
Explanation: Angular frequency ω = 2πf is measured in radian per second. Cycles per second is the hertz (ordinary frequency), metre per second is speed, and radian per metre is the wave number.
In SHM, displacement and velocity are 90° out of phase (v is maximum when x=0, and zero when x is extreme), while acceleration is always exactly opposite in sign to displacement, consistent with a = −ω²x.
Concept context
Simple harmonic motion, spring-mass, pendulum, energy in SHM, and resonance.