## MTALHAHASSAN2 one year ago Need help!! 1. Determine the angular velocity of the hour hand of a clock in radians per second. (two significant figures please).

1. MTALHAHASSAN2

@Mertsj

2. Mertsj

$\frac{2\pi}{12 hr}\times \frac{1 hr}{3600 \sec}=1.5 radians/\sec$

3. MTALHAHASSAN2

@Mertsj can you plz explain me how you get that values plz

4. Mertsj

Let me check. Maybe I hit a wrong button.

5. MTALHAHASSAN2

ok

6. Mertsj

Whoops. 1.5 x10^-4

7. MTALHAHASSAN2

oh ok but can you plz explain how you get 2pie/ 12 hrs and etc.

8. MTALHAHASSAN2

I am confuse

9. Mertsj

If the hour hand is on 1 where will it be in 12 hours?

10. MTALHAHASSAN2

on 1 again

11. MTALHAHASSAN2

because 12+1 is 13

12. Mertsj

Yes. It will have moved all the way around the circle (2pi radians) back to its starting point in 12 hours.The rest is just unit conversion.

13. MTALHAHASSAN2

ok but I still don't get 3600 how you get that

14. Mertsj

How many seconds are in 1 hour where you live?

15. MTALHAHASSAN2

60 sec

16. Mertsj

In America there are 60 seconds in 1 minute

17. MTALHAHASSAN2

so it be in 1 hour there is like 60min and 1 min is 60 sec. So it be 60X60 which is 3600

18. MTALHAHASSAN2

right?

19. Mertsj

Bingo!!! Good for you!!!

20. MTALHAHASSAN2

thanks

21. Mertsj

yw