NEET Class neet Answered
find average velocity and average speed if the second hand of clock turns to 10 sec
Asked by pramilac968 | 06 Jan, 2023, 09:02: PM
Expert Answer
Average velocity = displacement / time
Let r be the length of seconds hand in the clock.
In 10 seconds , second hand makes angular displacement 60o .
As shown in figure , displacement made by tip of second hand in 10 s is
displacement of tip of second hand = ( r cos60 ) 
+ ( r sin60-r) 
+ ( r sin60-r) displacement of tip of second hand = (r/2) + r [ (√3/2)-1 ]
+ r [ (√3/2)-1 ] average velocity of tip of second hand = displacement / time
average velocity of tip of second hand = (r/20) + (r/10) [ (√3/2)-1 ] = r [ 0.05 - 0.013 ]
+ (r/10) [ (√3/2)-1 ] = r [ 0.05 - 0.013 ]------------------------------------------------
Average speed = distance travelled / time
Distance travelled by tip of second hand in 10 seconds equals arc length AB as shown in figure
arc length AB = r × (
/3 ) =
/3 ) = Average speed = r × (/30 ) = 0.105 r
/30 ) = 0.105 r
Answered by Thiyagarajan K | 07 Jan, 2023, 12:19: AM
NEET neet - Physics
Asked by sa1033278 | 02 May, 2024, 07:37: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by ramanjaneyuluoguru | 25 Apr, 2024, 04:18: PM
ANSWERED BY EXPERT
NEET neet - Physics
Asked by onemile96 | 30 Mar, 2024, 01:04: PM
ANSWERED BY EXPERT
NEET neet - Physics
Asked by kulsawran12345 | 10 Mar, 2024, 07:31: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by khillare.sonu10 | 29 Feb, 2024, 09:44: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by vijayyadav08735 | 08 Feb, 2024, 03:31: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by rkr112744 | 31 Jan, 2024, 11:18: PM
ANSWERED BY EXPERTNEET neet - Physics
Asked by divyamahaver2506 | 28 Jan, 2024, 05:54: PM
ANSWERED BY EXPERT
