MTALHAHASSAN2
  • MTALHAHASSAN2
Need help!! 1. Determine the angular velocity of the hour hand of a clock in radians per second. (two significant figures please).
Mathematics
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SOLVED
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katieb
  • katieb
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MTALHAHASSAN2
  • MTALHAHASSAN2
@Mertsj
Mertsj
  • Mertsj
\[\frac{2\pi}{12 hr}\times \frac{1 hr}{3600 \sec}=1.5 radians/\sec\]
MTALHAHASSAN2
  • MTALHAHASSAN2
@Mertsj can you plz explain me how you get that values plz

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Mertsj
  • Mertsj
Let me check. Maybe I hit a wrong button.
MTALHAHASSAN2
  • MTALHAHASSAN2
ok
Mertsj
  • Mertsj
Whoops. 1.5 x10^-4
MTALHAHASSAN2
  • MTALHAHASSAN2
oh ok but can you plz explain how you get 2pie/ 12 hrs and etc.
MTALHAHASSAN2
  • MTALHAHASSAN2
I am confuse
Mertsj
  • Mertsj
If the hour hand is on 1 where will it be in 12 hours?
MTALHAHASSAN2
  • MTALHAHASSAN2
on 1 again
MTALHAHASSAN2
  • MTALHAHASSAN2
because 12+1 is 13
Mertsj
  • 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.
MTALHAHASSAN2
  • MTALHAHASSAN2
ok but I still don't get 3600 how you get that
Mertsj
  • Mertsj
How many seconds are in 1 hour where you live?
MTALHAHASSAN2
  • MTALHAHASSAN2
60 sec
Mertsj
  • Mertsj
In America there are 60 seconds in 1 minute
MTALHAHASSAN2
  • MTALHAHASSAN2
so it be in 1 hour there is like 60min and 1 min is 60 sec. So it be 60X60 which is 3600
MTALHAHASSAN2
  • MTALHAHASSAN2
right?
Mertsj
  • Mertsj
Bingo!!! Good for you!!!
MTALHAHASSAN2
  • MTALHAHASSAN2
thanks
Mertsj
  • Mertsj
yw

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