There are about 6 times 10^9 people on earth An average adult male weighs, say,

Question

There are about 6 times 10^9 people on earth An average adult male weighs, say, 75 kg an average adult female about 60 kg, and an average child will weigh less than 60 kg. Figuring roughly one child per adult, we can reasonably say that an average person's mass is about 50 kg, which gives the total mass of all humans on our planet as 6 times 10^9 times 50 = 3 times 10^11 kg Of course, we may be off in our estimates of the average mass or number of people. Although it would be unreasonable to say that we know the total mass is 3.0 times 10^11 kg, we can be reasonably sure that we have the correct order of magnitude: that is, we have the correct exponent to which the number 10 is raised. In each of the following problems, you will be asked to make similar estimates. If the entire population of the United States forms a human chain by holding hands, how many times can such a chain be wrapped around the earth's equator?

Explanation / Answer

poulation of united state = 323.1milion= 323.1*106

average palm to palm distance = 1 meter

length of humane chain = (323.1*106people)(1meter each) =323.1*106meter

circumference of earth = 4*107meter

chain devided by earth's cicumference is

(323.1*106)/(4*107)= 8.0775

so, 8 times the chain can be wrapped around earth equator

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