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CBSE Class 11-science Answered

The minute hand of a watch is 1.5 cm long. How far does its tip move in 40 minute?
Asked by Aditya | 09 Jan, 2013, 03:59: PM
answered-by-expert Expert Answer
in 40 minutes minute hand needle will rotate by an angle=360*40/60=240 degree=240*pi/180
                                                                                                                    =4pi/3 radian
so tip will move =r* theta
                       =1.5*4pi/3
                       =2pi c.m.
Answered by | 10 Jan, 2013, 02:48: PM
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