Modified Mastering Physics without Pearson eText-- Instant Access -- for Physics for Scientists & Engineers with Modern Physics
5th Edition
ISBN: 9780134402659
Author: GIANCOLI, Douglas
Publisher: PEARSON
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(III) The smallest meaningful measure of length is called the
Planck length, and is defined in terms of three fundamental
constants in nature: the speed of light c
the gravitational constant G = 6.67 × 10-11 m³/kg•s², and
Planck's constant h = 6.63 × 10-34 kg·m²/s. The Planck
length {p is given by the following combination of these
three constants:
3.00 × 10° m/s,
Gh
lp
Show that the dimensions of lp are length [L], and find the
order of magnitude of lp. [Recent theories (Chapters 32
and 33) suggest that the smallest particles (quarks, leptons)
are “strings" with lengths on the order of the Planck length,
10-35 m. These theories also suggest that the “Big Bang,"
with which the universe is believed to have begun, started
from an initial size on the order of the Planck length.]
We are going to make a simple approximation of the number of atoms in the universe.
Assume all the atoms in the universe are hydrogen. (In actual practice, over 75% of the atoms in the universe are hydrogen.)
Assume the sun is a typical star (made of pure hydrogen) has a density of 1.4 g/cm3 and is a sphere with a radius of 7.0*108m
Assume that there are 100 billion stars in our Milky Way galaxy that are identical to our sun.
Assume that there are 10 billion galaxies in the universe identical to our Milky Way galaxy. How many atoms are there in the universe?
(II) A light-year is the distance light travels in one year (at speed = 998 * 108 m/s). (a) How many meters are there in 1.00 light-year? (b) An astronomical unit (AU) is the average distance from the Sun to Earth, 1.50 * 108 km. How many AU are there in 1.00 light-year?
Chapter 1 Solutions
Modified Mastering Physics without Pearson eText-- Instant Access -- for Physics for Scientists & Engineers with Modern Physics
Ch. 1.3 - The area of a rectangle 4.5 cm by 3.25 cm is...Ch. 1.3 - For each of the following numbers, state the...Ch. 1.3 - Do 0.00324 and 0.00056 have the same number of...Ch. 1.3 - Write each of the following in scientific notation...Ch. 1.5 - Prob. 1FECh. 1 - Why is it incorrect to think that the more digits...Ch. 1 - Prob. 2QCh. 1 - Prob. 3QCh. 1 - Prob. 4QCh. 1 - Prob. 5Q
Ch. 1 - Prob. 7QCh. 1 - Prob. 1MCQCh. 1 - Prob. 2MCQCh. 1 - Prob. 3MCQCh. 1 - Prob. 5MCQCh. 1 - Prob. 6MCQCh. 1 - Prob. 7MCQCh. 1 - Prob. 8MCQCh. 1 - Prob. 9MCQCh. 1 - Prob. 10MCQCh. 1 - Prob. 1PCh. 1 - (I) Write the following numbers in powers of ten...Ch. 1 - (I) Write out the following numbers in full with...Ch. 1 - Prob. 4PCh. 1 - Prob. 5PCh. 1 - Prob. 6PCh. 1 - Prob. 7PCh. 1 - Prob. 8PCh. 1 - Prob. 9PCh. 1 - Prob. 10PCh. 1 - Prob. 11PCh. 1 - Prob. 12PCh. 1 - Prob. 13PCh. 1 - Prob. 14PCh. 1 - Prob. 15PCh. 1 - (I) Determine your own height in meters, and your...Ch. 1 - Prob. 17PCh. 1 - Prob. 18PCh. 1 - Prob. 19PCh. 1 - Prob. 20PCh. 1 - Prob. 21PCh. 1 - Prob. 22PCh. 1 - Prob. 23PCh. 1 - Prob. 24PCh. 1 - Prob. 25PCh. 1 - Prob. 26PCh. 1 - Prob. 27PCh. 1 - Prob. 28PCh. 1 - Prob. 29PCh. 1 - Prob. 30PCh. 1 - Prob. 31PCh. 1 - Prob. 32PCh. 1 - Prob. 33PCh. 1 - Prob. 34PCh. 1 - Prob. 35PCh. 1 - (II) Estimate how many hours it would take a...Ch. 1 - (II) Estimate the number of liters of water a...Ch. 1 - Prob. 39PCh. 1 - (II) Estimate how long it would take one person to...Ch. 1 - Prob. 42PCh. 1 - Prob. 43PCh. 1 - Prob. 44PCh. 1 - Prob. 45PCh. 1 - Prob. 46PCh. 1 - Prob. 47PCh. 1 - Prob. 48PCh. 1 - Prob. 49PCh. 1 - Prob. 50PCh. 1 - Prob. 51PCh. 1 - Prob. 52PCh. 1 - Prob. 53PCh. 1 - Prob. 54PCh. 1 - Prob. 57PCh. 1 - Prob. 58GPCh. 1 - Prob. 59GPCh. 1 - Prob. 60GPCh. 1 - Prob. 61GPCh. 1 - Prob. 62GPCh. 1 - A certain audio compact disc (CD) contains 783.216...Ch. 1 - Prob. 64GPCh. 1 - Prob. 65GPCh. 1 - Prob. 66GPCh. 1 - Prob. 67GPCh. 1 - Prob. 68GPCh. 1 - Noahs ark was ordered to be 300 cubits long, 50...Ch. 1 - One liter (1000cm3) of oil is spilled onto a...Ch. 1 - Prob. 71GPCh. 1 - Prob. 72GPCh. 1 - Prob. 73GPCh. 1 - Prob. 74GPCh. 1 - Prob. 76GPCh. 1 - Prob. 77GPCh. 1 - Prob. 78GPCh. 1 - Prob. 79GP
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