By Jennifer Boothroyd

An interesting examine the ways in which animals have interaction with humans and crops.

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7 Less Common Metric Prefixes The following are three metric prefixes which, while less common than the ones discussed previously, are well worth memorizing. 154 nm example = radius of the earth = size of a white blood cell = distance between carbon nuclei in an ethane molecule Note that the abbreviation for micro is the Greek letter mu, µ — a common mistake is to confuse it with m (milli) or M (mega). There are other prefixes even less common, used for extremely large and small quantities. For instance, 1 femtometer = 10−15 m is a convenient unit of distance in nuclear physics, and 1 gigabyte = 109 bytes is used for computers’ hard disks.

Everyone agrees it is Africa’s most populous nation. But what is its population? The United Nations says 114 million; the State Department, 120 million. 9 million, while the Central Intelligence Agency puts it at 126,635,626. What should bother you about this? Answer, p. 266 Dealing correctly with significant figures can save you time! Often, students copy down numbers from their calculators with eight significant figures of precision, then type them back in for a later calculation. That’s a waste of time, unless your original data had that kind of incredible precision.

5. 4 A hunting dog’s nose has about 10 square inches of active surface. How is this possible, since the dog’s nose is only about 1 in × 1 in × 1 in = 1 in3 ? After all, 10 is greater than 1, so how can it fit? 5 Estimate the number of blades of grass on a football field. 6 In a computer memory chip, each bit of information (a 0 or a 1) is stored in a single tiny circuit etched onto the surface of a silicon chip. The circuits cover the surface of the chip like lots in a housing development. A typical chip stores 64 Mb (megabytes) of data, where a byte is 8 bits.

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