Homework Help: science

Posted by Tammy on Sunday, September 2, 2007 at 10:04am.

An average human heart rate is 70 beats per minute. How many times it beats over 70 year lifetime? use scientific notation.

365 = the number of days in a year

70 years /1 * 365 days / year = 25,550
25,550/1 * 24 hours/ day = 613,200
613,200/1 * 60 minutes/ hour =36,792,000
70 beats/ minute * 36,792,000/1 = 2,575,440,000 beats / minute in a 70 year lifespan.

Then in scientific notation i got 2.57544 X 10^9

I was wondering if this is correct?

science - DrBob222, Sunday, September 2, 2007 at 11:11am
ok except I would use at the most 3 significant figures which would round the answer to 2.58 x 10^9.
science - bobpursley, Sunday, September 2, 2007 at 11:16am
Correct.

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