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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

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.)

(a)

To determine
The time duration in years.

Explanation

Given info: The total debt is $18 trillion. The rate at which payments are done is $1000 per second.

Explanation:

The time duration in years is

t=$18trillion$1000/s=$18×10

(b)

To determine
The number of bills required to encircle the planet.

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