Question

Consider a particle of mass m = 21.0 kg revolving around an axis with angular speed ω. The perpendicular distance from the particle to the axis is r = 1.75 m . (Figure 1)

Which of the following are units for expressing rotational velocity, commonly denoted by ω?

Check all that apply.

radians per second

degrees per second

meters per second

arc seconds

revolutions per second

Answer 1

It is given that, Mass 21.0 kg and radius (r) 1.75 m. As we know that normal velocity can be defined by distance travelled in per unit time. But, rotational velocity will be rotation per unit time which is denoted be rotation/s, radians per second which is denoted by rad/s, revolution per second which is denoted by rev/s and degrees per second which is denoted by deg/s. So, the correct options are (a) radians per second, (b) degrees per second and (e) revolution per second. -