1 Answer | Add Yours
it true that a point on a wheel rotates from 12 o’clock to 3 o’clock, so its angular displacement is 90 degrees. In one rotation ,wheel rotates 360 degrees.So In twelve hours a point which is rotating as a same speed by clock is rotating.A clock rotates 360 degree in 12 hours. So in three hours ,it will rotate only (360/4)= 90 degree.A point from where started rotating , take it at 12 o clock, at 3 Oclock ,it will change its position by 90 degree. Displcaement is cosidered as change of position, so in three hours it changed its position by 90 degree.
We’ve answered 319,199 questions. We can answer yours, too.Ask a question