Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 0, Problem 3P
To determine
The reason whymeter is not defined in a way so that
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A light-year is the distance light travels in one year at speed =2.998*10^8m/s
a) How many inches are there in 1.00 light-year?
(b) The parsec is an astronomical unit of length approximately equal to 3.08×1016 m. How many light-years are there in 1.00 parsec?
A light-year is a measure of the astronomical distance that light traverses in a vacuum in 1 year.
(a) How many kilometers does light traverse in 1 ly?
km
(b) What is the speed of light c in terms of ly per year.
ly/y
(c) Express your answer from (b) in terms of feet per nanosecond.
ft/ns
A light-year is a unit of distance corresponding to the distance light can travel in a vacuum in 1 year. If the speed of light is 3.0 x 108 m/s, what is the length of a light-year in: (a) km? (b) Em?
Chapter 0 Solutions
Physics Fundamentals
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- Roughly how many times longer than the mean life of an extremely unstable atomic nucleus is the lifetime of a human?arrow_forwardOn the planet Zebulon, the standard unit for length is the clorf (cl) and the standard unit for time is the beedle (be). After many years of research, you have determined that 1clort = 0.765 meters 1beedle = 1.957 seconds (1cl = 0.765m) (1be = 1.957s) If you are driving at a speed of 85mi / h , how fast are you going in terms of clorés per beedle (cl/be)? NOTE: 1 mi = 1609 m.arrow_forwardAll of the stars of the Big Dipper (part of the constellation Ursa Major) may appear to be the same distance from the earth, but in fact they are very far from each other. Figure shows the distances from the earth to each of these stars. The distances are given in light-years (ly), the distance that light travels in one year. One light-year equals 9.461 * 1015 m. (a) Alkaid and Merak are 25.6 apart in the earth’s sky. In a diagram, show the relative positions of Alkaid, Merak, and our sun. Find the distance in light-years from Alkaid to Merak. (b) To an inhabitant of a planet orbiting Merak, how many degrees apart in the sky would Alkaid and our sun be?arrow_forward
- A light-year (ly) is the distance light travels in one year (at speed of 2.998 ×× 108 m/sm/s ). An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 ×× 108 km. 1 year = 3.156 ×× 107 s. How many meters are there in 1.70 ly? Express your answer using three significant figures. Express in scientific notation! 1.70 ly = _________________m How many AU are there in 1.70 ly light-year? Express your answer using three significant figures. Express in scientific notation! 1.70 ly = _________________AUarrow_forward(a) A unit of time sometimes used in microscopic physics is the shake. One shake equals 108 s. Are there more shakes in a second than there are seconds in a year? (b) Humans have existed for about 106 years, whereas the universe is about 1010 years old. If the age of the universe is defined as 1 “universe day,” where a universe day consists of “universe seconds” as a normal day consists of normal seconds, how many universe seconds have humans existed?arrow_forwardThe speed of light in free space has been measured to be 2.99792458 x 108-m/s. Express the speed of light to (a) three significant figures, (b) five significant figures, and (c) seven significant figures.arrow_forward
- The speed of light in free space has been measured to be 2.99792458 x 108-m/s.Express the speed of light to (a) three significant figures, (b) five significant figures, and (c) seven significant figures.arrow_forward0.405 What is 0.76 to the proper number of significant figures?arrow_forwardA light-vear is the distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in one light-year? (1 mi = 1609 m, 1 y =365 d) 5.88 x 1015 mi O 9.46 x 1012 mi 5.88 x 1012 mi O 9,46 x 1015 miarrow_forward
- A light-year is the distance light travels in one year (at speed = 2.998 ? 108 ?⁄?) (a) How manymeters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sunto Earth, 1.50 ? 108 ??. How many AU are there in 1.00 light-year?arrow_forwardLight travels a distance of one mile in about 0.000005368. What is the estimated time written as a single digit times a power of 10arrow_forwardThe distance around the Earth's equator is 40,077 kilometers, and the population of the United States in 1,950 was approximately 150,000,000 people. If this many people were spaced equally around the equator, what would be the length of the space each person would have to the nearest centimeter? The approximate length the space would be cm.arrow_forward
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