At the time of this book's printing, the U.S. national debt is about $ 8 trillion. (a) If paymen

(a) First, we need to find out how many seconds it would take to pay off the debt at a rate of $

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At the time of this book's printing, the U.S. national debt is about $\$ 8$ trillion. (a) If payments were made at the rate of $\$ 1000$ per second, how many years would it take to pay off the debt, assuming no interest were charged? (b) A dollar bill is about 15.5 $\mathrm{cm}$ long. If eight trillion dollar bills were laid end to end around the Earth's equator, how many times would they encircle the planet: Take the radius of the Earth at the equator to be $6378 \mathrm{km} .$ Note: Before doing any of these calculations, try to guess at the answers. You may be very surprised.

          At the time of this book's printing, the U.S. national debt is about $\$ 8$ trillion. (a) If payments were made at the rate of $\$ 1000$ per second, how many years would it take to pay off the debt, assuming no interest were charged? (b) A dollar bill is about 15.5 $\mathrm{cm}$ long. If eight trillion dollar bills were laid end to end around the Earth's equator, how many times would they encircle the planet: Take the radius of the Earth at the equator to be $6378 \mathrm{km} .$ Note: Before doing any of these calculations, try to guess at the answers. You may be very surprised.

Added by Donald A.

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