In 2015, the U.S. national debt was about $18 trillion.(a) If payments were made at the rate of $1 000 per second,how many years would it take to pay off the debt, assumingthat no interest were charged? (b) A dollar bill is about 15.5cm long. If 18 trillion dollar bills were laid end to end aroundthe Earth’s equator, how many times would they encirclethe planet? Take the radius of the Earth at the equator to be6 378 km. (Note: Before doing any of these calculations, try toguess at the answers. You may be very surprised.)

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Asked Dec 16, 2019
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In 2015, the U.S. national debt was about $18 trillion.
(a) If payments were made at the rate of $1 000 per second,
how many years would it take to pay off the debt, assuming
that no interest were charged? (b) A dollar bill is about 15.5
cm long. If 18 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
6 378 km. (Note: Before doing any of these calculations, try to
guess at the answers. You may be very surprised.)

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Given Debt on US, D = $ 18 taillion P = lo00 Dollor doy Pay ment date, %3D Length of dollor bill, L= Radius of earth, R = 15.5 km %3D 6378 km Conrersion 100 cm 1 lem 1000m 12 1 hillion dollaç = 10"dollor 1. 2 year = 3.154 x 10s

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Number of year required to pay the debt. $ 1.0x102 $1 tillion, t 18 taillion 3.154 X10ts 1year Dallor second/ 1000 570 yeor

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