SOLUTION: Here's my question: If the minute hand of a big clock is 1.12m long, find the rate at which its tip is moving in centimetres per minute. Take pi=22/7. (2dps) Thanks in advanc

Question 983702: Here's my question:
If the minute hand of a big clock is 1.12m long, find the rate at which its tip is moving in centimetres per minute. Take pi=22/7. (2dps)
Thanks in advance! :)
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
The circumference(C) of the clock is pi * D, where D is the diameter,
D = 2 * r, r is radius and convert r to cm's
r = 1.12 * 100 = 112 cm's, now
D = 2 * 112 = 224 cm's
C = 22/7 * 224 = 22 * 32 = 704 cm's
rate * time = distance
rate * 60 = 704
note there are 60 minutes in an hour
rate = 704 / 60 = 11.733333333 cm's / minute

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