9. You also learn in class that one kilobyte of computer memory will hold about
ID: 2258569 • Letter: 9
Question
9. You also learn in class that one kilobyte of computer memory will hold about 2/3 of a page of typical text (without formatting). A typical book has about 400 pages. How many such books can a 9-gig flash drive hold? _______________
10. In your BIO 111 course you learn that human hair can vary in diameter, but one estimate of the average diameter is 50 microns or 50 x 10-6 meter. How many 10-nanometer (is 10 x 10-9) particles could be stacked across the diameter of a human hair? _________________
11. You also discussed in BIO 111 that there are approximately 3.999 million births per year in the United State. Express this quantity in births per minute. ___________________
Explanation / Answer
9. number of kilobytes one book will take:400x(2/3)= 800/3 kbs
1 gigabyte = 1000000 kbs=>9 gigabyte =9000000
therefore number of books that can be stored= (9000000x3)/800=33750 books
10. 50 microns = 50x10-6=5x10-5
10 nannometer = 10x10-9=10-8
therefore number of particles that can bestacked along the diameter = (5x10-5)/10-8 =5x103
11. 3.999 million/year = 39990000/year
1year = 365 days =365x24 hours = 365x24x60mins
therefore number of births per year = 39990000/(365x24x60) births/minute =76 births/minute (approximate)
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